import sys

sys.setrecursionlimit(10 ** 6)

def main():
    ss = []
    ss.append(input())
    ss.append(input())
    cnt = [[0] * 26 for _ in range(2)]
    for i, s in enumerate(ss):
        for c in s:
            cnt[i][ord(c) - ord("a")] += 1
    if cnt[0] == cnt[1]:
        print("YES")
    else:
        print("NO")

main()