#include "bits/stdc++.h"
using namespace std;
string stringA="";
string stringB="";
map<string, int> answers;
void init(string a, string b) {
stringA = a;
stringB = b;
}
int get_distance(int x, int y) {
string sA = stringA;
string sB = stringB;
map<char, int> countsB;
map<char, int> countsA;
int count = 0;
for(int i=x; i <= y; i++){
if(countsA.find(sA[i]) == countsA.end()){
countsA[sA[i]] = 1;
}else{
countsA[sA[i]] +=1;
}
if(countsB.find(sB[i]) == countsB.end()){
countsB[sB[i]] = 1;
}else{
countsB[sB[i]] +=1;
}
}
int lnA = countsA.size();
int lnB = countsB.size();
if(lnA != lnB){
return -1;
}for(auto c: countsA){
if(countsA[c.first] != countsB[c.first]){
return -1;
}
}
int i=x;
while (i <= y && sA != sB){
char c = sA[i];
string t = sA.substr(i, y) + ":"+sB.substr(i, y) ;
if(answers.find(t) != answers.end()){
count += answers[t];
break;
}
if(c == sB[i]){
i++;
continue;
}
for(int z=i+1; z <= y; z++){
if(sA[z] != sB[i] || sA[z] == sB[z]){
continue;
}
sA[i] = sA[z];
sA[z] = c;
if(lnA == 2 && lnB == 2){
i = z+1;
}
else{
i++;
}
count++;
}
}
answers[sA.substr(x, y) + ":" + sB.substr(x, y)] = count;
return count;
}
