a, b = input().split()

map_a = {}
map_b = {}

for i in range(len(a)):
    if a[i] in map_a:
        if (b[i] != map_a[a[i]]):
            print('false')
            break
    else:
        map_a[a[i]] = b[i]

    if b[i] in map_b:
        if (a[i] != map_b[b[i]]):
            print('false')
            break
    else:
        map_b[b[i]] = a[i]
else:
    print('true')