#include <iostream>
#include <string.h>
using namespace std;

int main() {

	char c[51],sirNou[51],nonLitere[]="0123456789 ";
	cin.get(c,50);
	
	int i,n = strlen(c),index = 0;
	for (i = 0; i < n; i++)
		if (!strchr(nonLitere,c[i]))
			sirNou[index++] = c[i];

	sirNou[index] = '\0';
	cout<<sirNou;

	return 0;
}