#include <stdio.h>
#include <stdlib.h>

int main(){
    int n;
    while(scanf("%d", &n)) {
        if(n >= 10) {
            int pom = n;

            int zigzag = 0;
            int ok = 1;
            while(n > 0) {
                int cifra = n % 10;
                n /= 10;
                if(zigzag == 0) {
                    if(cifra >= 5) {
                        ok = 0;
                    }
                    zigzag = 1;
                }
                else if(zigzag == 1) {
                    if(cifra < 5) {
                        ok = 0;
                    }
                    zigzag = 0;
                }
            }
            n = pom;
            zigzag = 0;
            int ok2 = 1;
            while(n > 0) {
                int cifra = n % 10;
                n /= 10;
                if(zigzag == 0) {
                    if(cifra < 5) {
                        ok2 = 0;
                    }
                    zigzag = 1;
                }
                else if(zigzag == 1) {
                    if(cifra >= 5) {
                        ok2 = 0;
                    }
                    zigzag = 0;
                }
            }
            if(ok == 1 || ok2 == 1) {
                printf("%d\n", pom);
            }


        }
    }

    return 0;

}