def output_character():
    list_num=list(map(int,input().split()))
    n=list_num[0]
    switch = 0
    count = 0
    for i in list_num[1:]:
        num=i

        for _ in range(num):
            if count%n==0:
                print()
            if switch==0:
                print(switch, end='')
                count+=1
            else:
                print(switch, end='')
                count += 1
        switch=  1- switch

output_character()