public class Solution{
char[] c = s.toCharArray();
int len = c.length;
if(len<=2){
System.out.println(c[len]);
}
int j=-1;
for(int i=0;i<len-2;i++){
if(c[i] == c[i+2] && c[i]!=c[i+1]){
j=i+2;
i++;
}else if(i != j){
System.out.println(c[i]);
}
}
}