ЛЮБЛЮ ВЕСНИНА

s = input()
b = ""
for i in range(len(s)):
    ordd = ord(s[i])
    k = s[i]
    if ordd >= 97 and ordd <= 122:
        k = chr(ordd - 32)
    elif ordd >= 1040 and ordd <= 1071:
        k = chr(ordd + 32)
    b += k
print(b)