#include <stdio.h>

int main() {
    int n = 0,sum = 0,x = 1,z = 0;
    scanf("%d",&n);
    while (n != 0) {
        sum = ((n % 10) % 2) * x;
        z += sum;
        n = n / 10;
        x = x * 10;
    }
    printf("%d",z);
    return 0;
}