#include <iostream>
#include <cmath>

int main() {
    int num;
    std::cin >> num;
    int original_num = num;
    int reverse_num = 0;
    while (num) {
        reverse_num = reverse_num * 10 + num % 10;
        num /= 10;
    }
    int difference = std::abs(original_num - reverse_num);
    std::cout << difference << std::endl;
    return 0;
}    
/**************************************************************
	Problem: 1702
	User: linmiaoling
	Language: C++
	Result: Wrong Answer
****************************************************************/