The input to the program is a natural number n is the number of rows and columns in the matrix, then the matrix elements (integers) line by line separated by a space.

#Example
# n = int(input())
# a = [[int(j) for j in input().split()] for i in range(n)]

n = int(input())
a = []
for i in range(n):
    row = input().split(' ')
    for j in range(len(row)):
        row[j] = int(row[j])
    a.append(row)