42 lines
810 B
C++
42 lines
810 B
C++
#include<iostream>
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using namespace std;
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bool al[26]={false};
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int main()
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{
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int n;
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int T=1;
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while(cin>>n&&n!=0)
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{
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memset(al,0,sizeof(al));
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al[0]=1;
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char c1,c2,c3;
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while(n--)
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{
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cin>>c1>>c2>>c3;
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if(al[c3-'a']==0)
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al[c1-'a']=0;
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else
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{
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al[c1-'a']=1;
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}
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}
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int ok=0;
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cout<<"Program #"<<T<<endl;
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for(int i=0;i<26;i++)
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{
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if(al[i])
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{
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ok=1;
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cout<<(char)(i+'a')<<" ";
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}
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}
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if(ok==1)
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cout<<endl;
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if(ok==0)
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cout<<"none"<<endl;
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cout<<endl;
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T++;
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}
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return 0;
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}
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