import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
n = ii()
l = input().split()
crt = 0
ans = ""
for i in l:
if crt < len(i):
ans += i[crt]
else:
ans += " "
crt = len(i) - 1
p(ans)
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
d = solve()