#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
#
# @param s string字符串
# @param c string字符串
# @return int整型
#
class Solution:
    def isCongruent(self, s: str, c: str) -> int:
        # write code here
        a, b = {}, {}
        for i, j in zip(s, c):
            a[i], b[j] = a.get(i, 0) + 1, b.get(j, 0) + 1
        return len(s) if a == b else -1