import random

def Flip():
    total = 0
    while True:
        f = random.randint(0,1)
        side = "Tails"
        if (f == 0):
            side = "Heads"
            total += 1
        print(side)
        
        command = input("Type 'Stop' if you want to leave the function.")
        if (command == "Stop"):
            break

    print("Leaving function.")
    return total

x = Flip()
print("Number of heads was " + str(x))