for idy, line in enumerate(montab):
    for idx, case in enumerate(line):
        # tes checks ici
        # si t'as peur de fail tes test, tu peu toujours faire un try: except:


for y in range(h):
        for x in range(w):
            if (nodes[y][x].v == "0"):
                print(nodes[y][x].x + " " + nodes[y][x].y + " ", end='')
                if (nodes[y][x + 1]):
                    print(nodes[y][x + 1].x + " " + nodes[y][x + 1].y + " ", end='')
                else:
                    print("-1 -1 ", end='')
                if (nodes[y + 1][x]):
                    print(nodes[y + 1][x].x + " " + nodes[y + 1][x].y)
                else:
                    print("-1 -1")