The translation from the Berland language into the Birland language is not an easy task. Those languages are very similar: a berlandish word differs from a birlandish word with the same meaning a little: it is spelled (and pronounced) reversely. For example, a Berlandish word code corresponds to a Birlandish word edoc. However, it's easy to make a mistake during the «translation». Vasya translated word *s* from Berlandish into Birlandish as *t*. Help him: find out if he translated the word correctly.
The first line contains word *s*, the second line contains word *t*. The words consist of lowercase Latin letters. The input data do not consist unnecessary spaces. The words are not empty and their lengths do not exceed 100 symbols.
number = input()
number = str((int(number) + 1))
while True:
    checked = True
    num = [0]*10
    for i in number:
        if num[int(i)] == 0:
            num[int(i)] = 1
        else:
            checked = False
            break
    if checked:
        print(number)
        exit()
    else:
        number = str((int(number) + 1))
        
