AL = [chr(i) for i in range(65, 91)]
aL = [chr(i) for i in range(97, 123)]

S = input()

ans = ''
for i in S:
    if i in AL:
        x = AL.index(i)
        ans += aL[x]
    else:
        x = aL.index(i)
        ans += AL[x]

print(ans)