import sys
input = sys.stdin.readline

N,ONE,TWO,THREE=list(map(int,input().split()))

A=[[-1]*N for i in range(N)]

for i in range(N):
    for j in range(N):
        if TWO>0:
            A[i][j]=2
            TWO-=1

for j in range(N):
    for i in range(N):
        if A[i][j]==-1 and ONE>0:
            A[i][j]=1
            ONE-=1

for j in range(N):
    for i in range(N):
        if A[i][j]==-1 and THREE>0:
            A[i][j]=3
            THREE-=1

for a in A:
    print("".join(map(str,a)))