#include <stdio.h>

int main(void) {
    long long number, remaining, reverse = 0;
    int sum = 0;
    if (scanf("%lld", &number) != 1 || number < 0 || number > 999999999999999999LL) {
        puts("Invalid input.");
        return 1;
    }
    remaining = number;
    do {
        int digit = (int)(remaining % 10);
        sum += digit;
        reverse = reverse * 10 + digit;
        remaining /= 10;
    } while (remaining != 0);
    printf("Digit sum: %d\n", sum);
    printf("Palindrome: %s\n", reverse == number ? "yes" : "no");
    return 0;
}