String a="aaabbbaaa";
String b="bbb";
String newA = "";
int i = 0;
while (i < a.indexOf(b)) {
newA += "+";
i++;
}
newA +=b;
i = a.lastIndexOf(b);
while (i < a.length()) {
newA += "+";
i++;
}
System.out.println(newA);
String a="aaabbbaaa";
String b="bbb";
String newA = "";
int i = 0;
while (i < a.indexOf(b)) {
newA += "+";
i++;
}
newA +=b;
i = a.lastIndexOf(b);
while (i < a.length()) {
newA += "+";
i++;
}
System.out.println(newA);