S=input()
a=[c for c in S]
p=['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z']
q=['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z']
t=len(a)
for i in range(0,t):
    for j in range(0,26):
        if a[i]==p[j]:
            a[i]=q[j]
        elif a[i]==q[j]:
            a[i]=p[j]
            break
b = ' '
for x in a:
    b += x
print(b)