def main():
    A = input()
    B = input()
    print(get_ans(A,B))

def get_ans(a, b):
    for s in list(a):
        if a.count(s) != b.count(s):
            return "NO"
        elif s not in b:
            return "NO"
    return "YES"

if __name__ == '__main__':
    main()