//#include "dna.h"
#include "bits/stdc++.h"
#define sp <<" "
#define el <<"\n"
#define S second
#define F first
#define pb push_back
#define all(ar) ar.begin(),ar.end()
#define pii pair<int,int>
using namespace std;
using ll = long long;
using ld = long double;
const ll mod = 100000007;
const ll si = 100005;
const ll inf = 7000;
ll po[si][3], pt[si][3],n;
unordered_map<char,ll> hau = {{'A',0},{'T',1},{'C',2}};
ll sco[si][6];
ll typ(char a,char b){
if(a == 'A' && b == 'T') return 0;
else if(a == 'A' && b == 'C') return 1;
else if(a == 'T' && b == 'A') return 2;
else if(a == 'T' && b == 'C') return 3;
else if(a == 'C' && b == 'A') return 4;
else return 5;
}
void init(std::string a, std::string b){
n = a.size();
memset(po,0,sizeof(po)); memset(pt,0,sizeof(pt)); memset(sco,0,sizeof(sco));
po[0][hau[a[0]]] += 1; pt[0][hau[b[0]]] += 1;
if(a[0] != b[0]) sco[0][typ(a[0],b[0])] += 1;
for(ll i = 1; i < n; i++){
for(ll j = 0; j < 3; j++){
po[i][j] = po[i - 1][j];
pt[i][j] = pt[i - 1][j];
sco[i][j] = sco[i - 1][j];
}
for(int j = 3; j < 6; j++) sco[i][j] = sco[i - 1][j];
po[i][hau[a[i]]] += 1;
pt[i][hau[b[i]]] += 1;
if(a[i] != b[i]) sco[i][typ(a[i],b[i])] += 1;
}
//for(int i = 0; i < n; i++,cout el) for(int j = 0; j < 6; j++) cout<<sco[i][j] sp;
return;
}
ll get(ll x,ll y,ll i,bool t){
ll ans = t ? pt[y][i] : po[y][i];
if(x) ans -= t ? pt[x - 1][i] : po[x - 1][i];
return ans;
}
ll get(ll x,ll y,ll t){
ll ans = sco[y][t];
if(x) ans -= sco[x - 1][t];
return ans;
}
bool hobe(ll x,ll y){
//cout<<get(x,y,0,0) sp<< get(x,y,0,1) sp<<get(x,y,1,0) sp<< get(x,y,1,1) sp<<get(x,y,2,0) sp<< get(x,y,2,1) el;
return (get(x,y,0,0) == get(x,y,0,1)) && (get(x,y,1,0) == get(x,y,1,1)) && (get(x,y,2,0) == get(x,y,2,1));
}
int get_distance(int x, int y) {
if(!hobe(x,y)) return -1;
ll at = get(x,y,0), ac = get(x,y,1), ta = get(x,y,2), tc = get(x,y,3), ca = get(x,y,4), ct = get(x,y,5);
//cout<<at sp<<ta sp<<tc sp<<ct sp<<ac sp<<ca el;
ll ans = 0,mtc,mac,mat = min(at,ta); at -= mat; ta -= mat; ans += mat;
mtc = min(tc,ct); tc -= mtc; ct -= mtc; ans += mtc;
mac = min(ac,ca); ac -= mac; ca -= mac; ans += mac;
ans += max(at,ta) + max(tc,ct);
return ans;
}
