61 lines
1.1 KiB
C++
61 lines
1.1 KiB
C++
#include <iostream>
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#include <string>
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#include <vector>
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#include <queue>
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#include <algorithm>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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/// This Contest and Compile does not support C++11.
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//#include <thread>
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//#include <mutex>
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//#include <condition_variable>
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//#include <functional>
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using namespace std;
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char line[1024];
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int main()
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{
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//cout<<"Hello World!"<<endl;
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int n;
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scanf("%d%*c",&n);
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for(int i=0;i<n;i++)
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{
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gets(line);
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if(!((line[0]>='A'&&line[0]<='Z')||(line[0]>='a'&&line[0]<='z')||(line[0]=='_')))
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{
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printf("no\n");
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continue;
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}
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int len=strlen(line);
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bool done=false;
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for(int j=1;j<len;j++)
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{
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if(!(
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(line[j]>='A'&&line[j]<='Z')||
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(line[j]>='a'&&line[j]<='z')||
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(line[j]=='_')||
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(line[j]>='0'&&line[j]<='9')
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))
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{
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printf("no\n");
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done=true;
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break;
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}
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}
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if(!done)
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{
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printf("yes\n");
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}
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}
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return 0;
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}
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