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n = int(input())
operation = input()
text = input()

result = ""
for char in text:
    if char.isalpha():
        if operation == "E":
            if char.islower():
                result += chr((ord(char) - ord('a') + n) % 26 + ord('a'))
            else:
                result += chr((ord(char) - ord('A') + n) % 26 + ord('A'))
        elif operation == "D":
            if char.islower():
                result += chr((ord(char) - ord('a') - n) % 26 + ord('a'))
            else:
                result += chr((ord(char) - ord('A') - n) % 26 + ord('A'))
    else:
        result += char
print(result)