li = input().split(" ")
N = int(li[0])
print_str = ""
for i in range(1,len(li)):
    if li[i] == "0":
        continue
    if i % 2 == 0:
        for j in range(int(li[i])):
            print_str += "1"
    else:
        for k in range(int(li[i])):
            print_str += "0"

for m in range(len(print_str)):
    if m % N == 0 and m != 0:
        print()
    print(print_str[m],end="")