longPalin

n = int(input())
string = list(input())

if(''.join(string[::-1]) == ''.join(string)):
    print(len(''.join(string)))
    print(''.join(string))
else:
    flag = 1
    for i in range(0,n):
        for j in range(0,i+1):
            if(''.join(string[j:n-i+j][::-1]) == ''.join(string[j:n-i+j])):
                print(len(''.join(string[j:n-i+j])))
                print(''.join(string[j:n-i+j]))
                flag=0

        if(flag==0):
            break