#include <iostream>
#include <vector>
using namespace std;
int rec(int number) {
    if(number == 0) {
        return 0;
    }
    int last_digit = number % 10;
    if(last_digit == 9) {
        last_digit = 7;
    }
    return rec(number / 10) * 10 + last_digit;
}
int main()
{
    int number;
    cin >> number;
    cout << rec(number) << endl;
    return 0;
}
// rec(9592) = rec(959) * 10 + 2 = 757 * 10 + 2 = 7572
// rec(959) = rec(95) * 10 + 7 = 75 * 10 + 7 = 757
// rec(95) = rec(9) * 10 + 5 = 7 * 10 + 5 = 75
// rec(9) = rec(0) * 10 + 7 = 0 * 10 + 7 = 7
// rec(0) = 0