l = "abcdefghijklmnopqrstuvwxyz"
u = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

word = input()

ans = []
for i in word:
    if i in l:
        idx = l.index(i)
        ans.append(u[idx])
    else:
        idx = u.index(i)
        ans.append(l[idx])
print("".join(ans))