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()
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