public class FRQSolutionStringRuns {
    public static void main(String[] args) {
        String s="laaah jjjjj,trddoooooo!";
        String maxRunChar="";
        int maxRun1=0;
        int runCount1=0;
        for(int i=0; i<s.length(); i++){
            //aaaah jjjjj,trddoooooo!
            String previous="";
            String next="";
            String current=s.substring(i,i+1);
            if(i>0) {
                previous = s.substring(i - 1, i);
            }
            if(i<s.length()-1) {
                next= s.substring(i + 1, i + 2);
            }

            if(current.equals(next)){
                runCount1++;
            }else if(current.equals(previous)){
                runCount1++;
                if(runCount1>maxRun1) {
                    maxRun1 = runCount1;
                    maxRunChar = current;
                }
                runCount1=0;
            }

        }
        System.out.printf("Max Run: %d, MaxRunChar: %s\n",maxRun1, maxRunChar);
    }
}