li = list(input().split()) a = input() if a.count(li[1]) == 0: b = a else: for i in range(a.count(li[1])): b = a.replace(li[1], li[2]) if b.count(li[3]) == 0: c = b else: for i in range(b.count(li[3])): c = b.replace(li[3], li[4]) print(c)