n = int(input())

output = []
row = 1
for _ in range(n):
    costs = map(int, input().split())
    for col, cost in enumerate(costs, start=1):
        if cost >= 0:
            output.append([row, col, cost])
    row += 1
print(len(output))
for m in output:
    u, v, c = map(str, m)
    print(" ".join((u, v, c)))