#include <stdio.h>

long long reverseNumber(long long num) {
    long long reversed = 0;
    
    while (num != 0) {
        reversed = reversed * 10 + num % 10;
        num /= 10;
    }
    
    return reversed;
}

int main() {
    long long number;
    
    printf("请输入一个数字：");
    scanf("%lld", &number);
    
    long long reversed = reverseNumber(number);
    
    printf("原始数字: %lld\n", number);
    printf("倒序数字: %lld\n", reversed);
    
    return 0;
}