#include <stdio.h>
#include <stdbool.h>

void main(void){
	char numList[100000] = "a";
	scanf("%s",numList);
	bool flgFour = false;
	bool flgSix = false;
	int i = 0;
	while(numList[i] != '\0'){
		if(!flgFour && numList[i] == '4'){
			flgFour = true;
		}else if(!flgSix && numList[i] == '6'){
			flgSix = true;
		}
		if(flgFour && flgSix){
			break;
		}
		i++;
	}
	if(flgFour && flgSix){
		printf("Beautiful");
	}else{
		printf("...");
	}
}