AC代码

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

int main(){
string s;
getline(cin,s);
int a = 0,b = 0,c = 0;
for(int i = 0;i < s.size() - 1;i++){
if(s[i] >= 'a' && s[i] <= 'z'){
a++;
}else if(s[i] >= '0' && s[i] <= '9'){
b++;
}else{
c++;
}
}
cout<<"Letters="<<a<<endl;
cout<<"Digits="<<b<<endl;
cout<<"Others="<<c<<endl;
return 0;
}