#include <stdio.h>
#include <string.h>
void main(void){
	char s[1000000] = "a";
	scanf("%s",s);
	int ans = 0;
	printf("%c",s[ans]);
	while(s[ans] != '\0'){
		if(s[ans] != s[ans+1]){
			printf("%c",s[ans]);
			ans++;
		}
	}
}