CesarEncryption

from string import ascii_uppercase, ascii_lowercase

try:
    k = int(input())
    inputStr = input()
    result = ""

    for i in range(0, len(inputStr)):
        if ord(inputStr[i]) > 64 and ord(inputStr[i]) < 92:
            encryptedPos = (ord(inputStr[i]) - 65) + k
            encryptedIndex = encryptedPos if encryptedPos < len(ascii_uppercase) else encryptedPos - len(ascii_uppercase)
            result += ascii_uppercase[encryptedIndex]
        elif inputStr[i] in ascii_lowercase:
            result = "INVALID INPUT"
            break
        else:
            result += inputStr[i]

    print(result)

except:
    print("INVALID INPUT")