题解（有难度）

#include<bits/stdc++.h>
using namespace std;
int main(){
char c;
cin>>c;
if (c >= 'A' && c <= 'Z') {
cout << "A" << endl;
} else if (c >= 'a' && c <= 'z') {
cout << "a" << endl;
} else if (c >= '0' && c <= '9') {
cout << "0" << endl;
} else {
cout << "other" << endl;
}

return 0;

}