题解

STL

#include <bits/stdc++.h>
using namespace std;

int main()
{
    char c;
    cin>>c;
    if(isupper(c)) cout<<'A';
    else if(islower(c)) cout<<'a';
    else if(isdigit(c)) cout<<0;
    else cout<<"other";
    return 0;
}