#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define vl vector<ll>
#define vs vector<string>
#define vb vector<bool>
#define vc vector<char>
#define ull unsigned long long
#define pll pair<ll, ll>
#define pb push_back
#define fi first
#define se second
#define ff(i, p, x) for (ll i = p; i < x; i++)
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()
#define ed "\n"
#define IO std::ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
ll MOD = 1e9+7;
string a, b;
void init(string A, string B){
a = A;
b = B;
}
int get_distance(int x, int y){
ll aa = 0, at = 0, ac = 0;
ll ba = 0, bt = 0, bc = 0;
bool eq = false, othereq = false;
ff(i, x, y+1){
if(a[i] == 'A'){
aa++;
}
if(a[i] == 'T'){
at++;
}
if(a[i] == 'C'){
ac++;
}
if(eq && a[i] == b[i]){
othereq = true;
}
if(a[i] == b[i]){
eq = true;
}
}
ff(i, x, y+1){
if(b[i] == 'A'){
ba++;
}
if(b[i] == 'T'){
bt++;
}
if(b[i] == 'C'){
bc++;
}
}
if(y-x == 0){
if(a[x] == b[x]){
return 0;
}
else{
return -1;
}
}
else if(y-x == 1){
if(aa != ba || at != bt || ac != bc){
return -1;
}
else{
if(a[x] == b[x]){
return 0;
}
else{
return 1;
}
}
}
else if(y-x == 2){
if(aa != ba || at != bt || ac != bc){
return -1;
}
else{
if(othereq){
return 0;
}
else if(eq){
return 1;
}
else{
return 2;
}
}
}
return 40;
}
