N, A, B, C = map(int, input().split())

S = [[0 for _ in range(N)] for __ in range(N)]
p = 0
for i in range(N):
    for j in range(N):
        if p < B:
            S[i][j] = 2
        elif p < A+B:
            S[i][j] = 1
        else:
            S[i][j] = 3
        p += 1

for i in range(N):
    for j in range(N):
        print(S[i][j], end='')
    print()