Merging and Squashing in python

n = int((input()))

line = []

for i in range(n):

    num_i = input()

    line.append(num_i)

    line_s = str(''.join(line))

    line_l = list(line_s)

    line_l.pop(0) and line_l.pop()

    for i in range(n-1):

        line_l[i:i+2] = [''.join(line_l[i:i+2])]

output = ' '.join([str(el) for el in line_l])

print(output)