题解 | #判断字母#

#include <stdio.h>

int main() {
    int ch = 0;
    while ((ch = getchar()) != EOF) {
        if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) {
            printf("YES\n");
        } else {
            printf("NO\n");
        }
        getchar();
    }
    return 0;
}