输入一个整数，如果是两位数那么输出”yes”否则输出”no”

#include <bits/stdc++.h>
using namespace std;
int main(){  
freopen("p1682.in","r",stdin);
freopen("p1682.out","w",stdout);
int a;
cin>>a;
if(a>9&&a<100){
cout<<"yes";
}
else{
cout<<"no";
}
fclose(stdin);
fclose(stdout);
return 0;
}