#include "dna.h"
#include<bits/stdc++.h>
using namespace std;
string A,B;
void init(string a, string b) {
    A=a;
    B=b;
}
int get_distance(int x, int y) {
  int count;
  map<char,int>m2;
    map<char,int>m1;
 
      count=0;
      for(int so=x;so<=y;so++){
          if(A[so]!=B[so]){count++;m2[A[so]]+=1;m1[B[so]]+=1;}
      }
      if(m1['A']==m2['A']&&m1['C']==m2['C']&&m1['T']==m2['T']){
         
          return max(0,count-1);
          
      }
else {return -1;} 
  
}
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