Replace, for loops, format, and count the replacements in Python list

Question

I need help editing my code so the output ends up like this:

Enter target word: red

Enter replacement word: pink

Number of replacements: 3

Original list:

blue, red, yellow, green, red, black, white, gray, blue, blue, red

List with replacement:

blue, pink, yellow, green, pink, black, white, gray, blue, blue, pink

Basically, I need to fix my code so that my original list and the replaced list use a for loop, but I also have to use the replace function, and at the same time I have to print the number of replacements (Which I don't know how to do).
Here's what my code looks like so far:

def replace (list1, target, replaceWord):
    new = ""
    for word in list1:
        if word == target:
            new += replaceWord + (", "[-1])
        else:
            new += word + (", "[-1])
    return new

def main():
    print ("Welcome! Enter your words one at a time and hit enter after each value.\nWhen you are done entering values, type stop.")
    inp = input ("Enter first value: ")
    list1 = []
    while inp !="stop":
        list1.append(inp)
        inp = input ("Enter first value: ")

    target = input ("Enter target word :")
    replaceWord =  input ("Enter replacement word: ")
    print()
    newlist = replace(list1,target,replaceWord)
    for i in newlist:
##     reps = ( )
##     reps += str (replaceWord)
    print ("Number of replacements: " +(reps))
    print ("Original list: " + (str (list1)))
    print ("List with replacement: " + newlist)

main()

Please help, thank you so much

Answer 1

def replace (list1, target, replaceWord):
    new = []
    replacements_no = 0
    for word in list1:
        if word == target:
            new.append(replaceWord)
            replacements_no += 1
        else:
            new.append(word)

    return new, replacements_no

def main():
    print ("Welcome! Enter your words one at a time and hit enter after each value.\nWhen you are done entering values, type stop.")
    inp = input ("Enter first value: ")
    list1 = []
    while inp !="stop":
        list1.append(inp)
        inp = input ("Enter first value: ")

    target = input("Enter targe word :")
    replaceWord = input("Enter replacement word: ")
    print()
    newlist, replacements = replace(list1,target,replaceWord)
    print("Number of replacements: {}".format(replacements))
    print ("Original list: " + (str (list1)))
    print ("List with replacement: {}".format(', '.join(newlist)))

main()

something like this should work. you do not have to stick together words in replace function, you can build new list.