def twoStrings(s1, s2):
    x=list(set(s1))
    y=list(set(s2))
    for i in x:
        for j in y:
            if i==j:
                return 'YES'
    return 'NO'

def twoStrings(s1, s2):
    set1 = set(s1)
    set2 = set(s2)
    return "YES" if set1 & set2 else "NO"

def twoStrings(s1, s2):
    def bitmask(s):
        bitmask = 0
        for char in s:
            bitmask |= (1 << (ord(char) - ord('a')))
        return bitmask
    bm1 = bitmask(s1)
    bm2 = bitmask(s2)
    return "YES" if bm1 & bm2 else "NO"