题解

#include<iostream>
using namespace std;
int main(){
    int n;
    cin>>n;
    if(n>=10&&n<=99){
        cout<<"yes";
    }else{
        cout<<"no";
    }
    return 0;
}

#include<iostream>
using namespace std;
int main(){
    int n,sum=0;
    cin>>n;
    while(n!=0){
        n/=10;
        sum++;
    }
    if(sum==2){
        cout<<"yes";
    }else{
        cout<<"no";
    }
    return 0;
}