40 lines
694 B
C++
40 lines
694 B
C++
#include <cstring>
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#include <cstdio>
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#include <cstdlib>
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int c[26];
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char buff[1024];
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int main()
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{
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int n;
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while(scanf("%d%*c",&n)==1)
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{
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gets(buff);
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memset(c,0,sizeof(int)*26);
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for(int i=0;i<n;i++)
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{
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if(buff[i]>='A'&&buff[i]<='Z')
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{
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++c[buff[i]-'A'];
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}
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else
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{
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++c[buff[i]-'a'];
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}
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}
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bool flag=true;
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for(int i=0;i<26;i++)
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{
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if(c[i]<1) flag=false;
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}
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if(!flag)
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{
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printf("NO\n");
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}
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else
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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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