题解

#include<iostream>
#include<cstring>
using namespace std;
int main( ){
string s;
getline(cin,s);
int l=0,d=0,o=0,idx=0;
while(s[idx]!='?'){
if(s[idx]>='a'&&s[idx]<='z'){
l++;
}else if(s[idx]>='0'&&s[idx]<='9'){
d++;
}else {
o++;
}
idx++;
}
cout<<"Letters="<<l<<endl;
cout<<"Digits="<<d<<endl;
cout<<"Others="<<o<<endl;
return 0;
}