#include<stdio.h>
int main(){
    int n;
    int result=0;
    scanf("%d",&n);
    result=fun(n);
    printf("%d",result);

}
int fun(int n){
    int d,e=1,m=0;
    while(n!=0){
        d=n%10;
        if(d%2==0){
            m=d*e+m;
            e=e*10;
        }
        n=n/10;
    }
    return m;
}