image = open("input.txt", "r").read().rstrip()
image = [image[i:i+150] for i in range(0, len(image), 150)]
pixels = []
for i in range(150):
    m = []
    for j in range(150):
        m.append(image[j][i])
    pixels.append(m)

def get_first_visible(a):
    for i in a:
        if(i != "2"):
            return i

a = [get_first_visible(i) for i in pixels]
print("".join(a))