Matrix Modification

def is_valid(i: int):
    return 0 <= i < size


size = int(input())

matrix = [[int(x) for x in input().split()] for _ in range(size)]

while True:
    command = input()
    if command == 'END':
        break
    tokens = command.split()
    row = int(tokens[1])
    col = int(tokens[2])
    value = int(tokens[3])
    if tokens[0] == 'Add':
        if is_valid(row) and is_valid(col):
            matrix[row][col] += value
        else:
            print('Invalid coordinates')
    elif tokens[0] == 'Subtract':
        if is_valid(row) and is_valid(col):
            matrix[row][col] -= value
        else:
            print('Invalid coordinates')

[print(' '.join(map(str, x))) for x in matrix]