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

if A <= C :
    a = 3
    c = 1
    KA = C
    KC = A
else:
    a = 1
    c = 3
    KA = A
    KC = C

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

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