str_length = int(input())
input_str = input()

if str_length%2 == 1:
    print("No") 

else:
    output_a = ""
    output_b = ""
    for i, c in enumerate(input_str):
        if i % 2 == 0:
            output_a += c
        else:
            output_b += c

    print(output_a + " " + output_b)