package main

import . "fmt"

func main() {
	var s string
	Scan(&s)
	m:=map[rune]bool{}
	for _,c:=range s {
		m[c]=true
	}
	if len(s)<=3&&m['A']&&m['C'] {
		Println("Done!")
	} else {
		Println("Failed...")
	}
}