import random as r

a = []
size = 20
for i in range(size):
    b = []
    for o in range(size):
        n = r.randint(1,10)
        if n > 8:
            b.append('a')
        else:
            b.append('0')
    a.append(b)
with open("table.txt","w") as file:
    for line in a:
        for item in line:
            file.write(f"{item} ")
        file.write("\n")