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28 lines
413 B
C++
28 lines
413 B
C++
#include <iostream>
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#include <iomanip>
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#include <cstring>
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using namespace std;
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int main(){
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char a[10000];
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int b=0;
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cin >>a;
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if(a[0]>='0' && a[0]<='9'){
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cout <<"no";
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return 0;
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}
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for(int i=1;i<strlen(a);i++){
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if((a[i]>='a' && a[i]<='z') || (a[i]>='A' && a[i]<='Z') || (a[i]>='0' && a[i]<='9') || a[i]=='_'){
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b++;
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}
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}
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if(b==strlen(a)-1){
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cout <<"yes";
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}
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else{
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cout <<"no";
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}
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return 0;
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}
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