RPS problem

#main
def playRPS(userChoice):
    compChoice = generateCompChoice()
    determineWinner(compChoice, userChoice)
    printOutcome(userChoice, compChoice, determineWinner)

import random
def generateCompChoice():
#computer generates a random number
    number = random.randint(0,2)
    if number == 0:
        return "rock"
    elif number == 1:
        return "paper"
    elif number == 2:
        return "scissors"
# returns number as a string

# Determine the winner
# Input compChoice, userChoice
def determineWinner(compChoice, userChoice):
    if ((compChoice == "rock" and userChoice == "r") or (compChoice == "paper" and userChoice == "p") or (compChoice == "scissors" and userChoice == "s")):
        return "tied"
    elif ((compChoice == "rock" and userChoice == "p") or (compChoice == "paper" and userChoice == "s") or (compChoice == "scissors" and userChoice == "r")):
        return "won"
    else:
        return "lost"

def userInput(userChoice):
    if userChoice == "r":
        return "rock"
    elif userChoice == "p":
        return "paper"
    else:
        return "scissors"
def printOutcome(userChoice, compChoice, determineWinner):
    print("You chose " + userInput(userChoice) + " and the computer chose " + compChoice + ", so you " + determineWinner(compChoice, userChoice) + ".")

print("Welcome to rock, paper, scissors!")
userChoice = input("choose your item [r/p/s]:")
playRPS(userChoice)