// yukicoder: No.552 十分簡単な星1の問題
// 2019.4.18 bal4u

#include <stdio.h>
#include <ctype.h>

#if 1
#define gc() getchar_unlocked()
#define pc(c) putchar_unlocked(c)
#else
#define gc() getchar()
#define pc(c) putchar(c)
#endif
int ins(char *s)
{
	char *p = s;
	do *s = gc();
	while (*s++ > ' ');
	*--s = 0;
	return s - p;
}

void outs(char *s) { while (*s) pc(*s++); }

char s[25];

int main()
{
	int w = ins(s);
	if (s[0] != '0') s[w] = '0';
	outs(s), pc('\n');
	return 0;
}