How to change from reading files to sys.stdin.readlines()

Question

Here is my original code.

f = open("p3.in","r")
while True:
    n = f.readline()
    print(n)
    if n == 0:
        break
    Map = [[0 for i in range(n)] for j in range(n)]
    for i in range(n):
        l = f.readline()
        for j in list(map(int, l.split())):
            Map[i][j] = 1
    for i in range(n):
        for j in range(n):
            print(Map[i][j], end=" ")
        print()

This is what I used for p3.in.

3
1
2 0
1 
4 
1 3 2
2 3
3 
0 2
0

I can print with the original code,

3
0 1 0 
1 0 1 
0 1 0 
4
0 1 1 1 
0 0 1 1 
0 0 0 1 
1 0 1 0 
0

but I want to change it to

import sys

while True:
    n = sys.stdin.readlines()

Because my file submission system already has this file of p3.in loaded in the system. I am unable to print the results after modifying:

TypeError: 'list' object cannot be interpreted as an integer Map = [[0 for i in range(n)] for j in range(n)]  

But I have no clue how to change the code after several attempts. Please help me with the problem.