public class LongestSequence {

    public static void main(String [] args) {

        String input = args[0];
        int ld = 0;
        int [] inArr = new int[100];
        int numInts = 0;
        String substr = "";


        for (int i = 0; i < input.length(); i++) {
            if(input.charAt(i) == ' ') {
                substr = input.substring(ld,i);
                inArr[numInts++] = Integer.parseInt(substr);
                ld = ++i;
            }
        }
        substr = input.substring(ld);
        inArr[numInts++] = Integer.parseInt(substr);

        if(numInts == 1 || numInts == 2) {
            System.out.println("Longest Sequence: " + numInts);
            return;
        }

        int a = inArr[0];
        int b = inArr[1];
        int c = -99;
        int ls = 2;
        int cs = 2;

        for(int i = 2; i < numInts; i++) {
            c = inArr[i];
            if (c == a || c == b) {
                cs++;
                if (cs > ls) {
                    ls = cs;
                }
            } else {
                cs = 2;
                a = inArr[i-1];
                b = inArr[i];
            }
        }

        System.out.println("Longest Sequence: " + ls);
    }

}