C语言版本

#include <stdio.h>

int main() {
    char s[251];
    scanf("%[^\n]", s);
    int count = 0;
    for (int i = 0; i < strlen(s); i++) {
        if ('A' <= s[i] && s[i] <= 'Z') {
            count += 1;
        }
    }
    printf("%d\n", count);
    return 0;
}

Python版本

while True:
    try:
        content = input()
        count = len([i for i in content if i.isupper()])
        print(count)
    except:
        break