麦的答案

#include <iostream>
#include <string>
using namespace std;

int main() {
    string s;
    getline(cin, s);
    int upper = 0, lower = 0, space = 0;
    for (char ch : s) {
        if (ch >= 'A' && ch <= 'Z')
            upper++;
        else if (ch >= 'a' && ch <= 'z')
            lower++;
        else if (ch == ' ')
            space++;
    }
    cout << upper << " " << lower << " " << space << endl;
    return 0;
}