import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int ws = 1;
int num = 0;//最终输出的数
int x = 1;//所在位数
int m = n;//把n的值赋给m 目的是求出n是位数
while(m != 0) {
m /= 10;
ws++;
}
for(int i = 0; i < ws; i++) {
if(n % 10 % 2 == 0) {//如果是偶数,只增加位数,输出数不变
n = n / 10;
x *= 10;
} else {
num = num + x;
n = n / 10;
x *= 10;
}
}
System.out.println(num);
}
}