# Template for Palindrome

# Read in the input
N = int(input().strip())
# "readline" also includes the newline marking the end of the line (if there is one).
# We add a .strip() which gets rid of it for us.
line = input().strip()

# Convert the string to a list so we can modify it
line = list(line)

# The characters of the palindrome are line[0], line[1], ..., line[N-1]
# TODO: Solve the problem

# Convert back to a string for printing
line = "".join(line)

print(line)