from random import choice
from time import sleep


text = "Hello World"
p = ""
f = "abcdefghijklmnopqrstwxvuyzABCDEFGHIJKLMNOPQRSTWXVUYZ "
for i in range(len(text)):
    t = choice(f)
    while t != text[i]:
        t = choice(f)
        print(f"{p}{t}")
        sleep(0.01)
    p += t