/**
 * @author weichen CHEN created on 2018/4/20
 * @version 2018/4/20  weichen CHEN
 */
public class Test {


    public static void main(String[] args) {

        String a = "abcabcabca";
String b = "ababcacccbcab";
        char[] x = a.toCharArray();
        char[] y = b.toCharArray();
        int count = 0
 
;
        int maxlength = 0;
        int start = 0;
        for (int k = 1; k <= y.length; k++){

            for (int i = 0; i < x.length-k+1; i++) {

                for (int j = 0; j < y.length - k + 1; j++) {

                    count=0;
                    for (int l = 0; l < k; l++)
                        if 
 
(y[j + l] == x[i + l])
                            count++;
                    if (count == k && k > maxlength) {
                        maxlength = k;
start = j;
}

                }

            }
        }

        if(maxlength==0)
            System.out.println("no");
        else
            for
 
(int i=0; i<maxlength; i++)
                System.out.println(y[start+i]);
}


}