t1.py

def main():
    while(True):
            name = str(input("Please Enter Your Name\n> "))

            print("\n")

            name = name.lower()

            temp = []
            letter = ''
            state = 1

            for i in name:
                if i in temp:
                    if letter == '' or letter == i:
                        letter = i
                        state = 2
                        temp.append(i)
                    else:
                        state = 3
                        temp.append(i)
                else:
                    temp.append(i)

            if state == 1:
                print(name)
            elif state == 2:
                print(name.replace(letter, "*"))
            else:
                print("Equal Number Of Chars")

            print("\n")

if __name__ == "__main__":
    main()