#include <stdio.h>
#define BUFFERSIZE 1024

void main ()
{
	char ans[BUFFERSIZE];
	char c;
	int count = 0;
	
	while ((c = getchar()) != EOF && c != '\n' && count < BUFFERSIZE - 1) {
		if (c >= '0' && c <= '9') {
			ans[count++] = c;
		}
	}
	
	if (count) {
		ans[count] = '\0';
		printf("%s\n", ans);
	} else {
		printf("数字が入力されていません\n");
	}
}