import sys

def main():
	col = int(sys.stdin.readline())
	while col > 0:
		out = []
		row = sys.stdin.readline()
		i = len(row) // col
		for i in range(len(row) // col):
			for j in range(col):
				out.append(row[j*col+i])
		sys.stdout.write(''.join(out) + '\n')
		col = int(sys.stdin.readline())
		
if __name__ == '__main__':
	main()