import sys
input = sys.stdin.readline

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

def check(A):
    for i in range(N):
        for j in range(N-1,-1-1):
            if A[i][j]==2:
                X=[]
                for x,y in [(i,j+1),(i,j-1),(i+1,j),(i-1,j)]:
                    if 0<=x<N and 0<=y<N:
                        X.append(A[x][y])

                if 1 in X and 3 in X:
                    return (i,j)

    return True

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

while True:
    C=check(A)

    if C==True:
        break

    i,j=C

    flag=0

    for x in range(N-1,-1,-1):
        if flag==1:
            break
        for y in range(N-1,-1,-1):
            if A[x][y]!=2:
                k=A[x][y]
                A[i][j]=k
                A[x][y]=2
                flag=1
                break
                

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