import sys
import itertools

def resolve(in_):
    A = next(in_).strip()
    B = next(in_).strip()

    a = sorted(A)
    b = sorted(B)

    return 'YES' if a == b else 'NO'



def main():
    ans = resolve(sys.stdin)
    print(ans)


if __name__ == '__main__':
    main()