#include<bits/stdc++.h>
#include<chrono>
using namespace std;
using namespace chrono;
#define all(a) a.begin(), a.end()
#define sz(x) (int(x.size()))
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, ll> pil;
typedef pair<ll, int> pli;
typedef vector<string> vs;
template<class T1, class T2>
istream &operator>>(istream &in, pair<T1, T2> &P){
	in >> P.first >> P.second;
	return in;
}
template<class T1, class T2>
ostream &operator<<(ostream &out, pair<T1, T2> &P){
	out << "(" << P.first << ", " << P.second << ")";
	return out;
}
template<class T>
istream &operator>>(istream &in, vector<T> &arr){
	for(auto &x: arr) in >> x;
	return in;
}
template<class T>
ostream &operator<<(ostream &out, vector<T> &arr){
	for(auto &x: arr) out << x << ' '; cout << "\n";
	return out;
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	string s, t;
	cin >> s >> t;
	vi cnts(26), cntt(26);
	for(auto c: s) cnts[c - 'a'] ++;
	for(auto c: t) cntt[c - 'a'] ++;
	for(int i = 0; i < 26; i ++){
		if(cntt[i] && !cnts[i]){
			cout << -1;
			return 0;
		}
	}
	int n = sz(s);
	vector<vi> next(n, vi(26, n));
	for(int i = n - 2; i >= 0; i --){
		for(int c = 0; c < 26; c ++){
			if(s[i + 1] == c + 'a'){
				next[i][c] = i + 1;
			}
			else{
				next[i][c] = next[i + 1][c];
			}
		}
	}
	for(int i = n - 1; i >= 0; i --){
		for(int c = 0; c < 26; c ++){
			if(next[i][c] == n){
				next[i][c] = next[0][c];
			}
		}
	}
	int m = sz(t);
	ll res = 0;
	for(int i = 0, j = 0; i < m; i ++){
		if(t[i] == s[j]){
			res ++;
			(j += 1) %= n;
		}
		else{
			res += (next[j][t[i] - 'a'] - j + n) % n + 1;
			j = (next[j][t[i] - 'a'] + 1) % n;
		}
	}
	cout << res;
	return 0;
}

//////////////////////////////////////////////////////////////////////////////////////////////////////
//                                                                                                  //
//                                                                                                  //
//                                              _____________                                       //
//             ++++++++++                ___------------------\\\\                                  //
//           +++`+``+`+`++++        ///`````````````````````````````\\\                             //
//           ++`+`+``+++`++++  /////```````````````````````````````````\\                           //
//           +++`++`+`+``+++/////`````````````````````````````````````````\\                        //
//             +++`++`+``+///```````````|```````````````````````````````````\\                      //
//          ____++++/++++/`````````````/````````|````````|```````````````````\\                     //
//        /  /  / |    //``````````````|````````|```````|````````|````````````\\                    //
//       /  /  /  | ///````````/```````|```````||```````|````````|``````\```````\\                  //
//       | /  /   |///`````````|``````/````````|````````|````````|```````|```````\\                 //
//       |/   |   |//``|```````|``````|````````|`````````|```````|```````|````````\\                //
//       /\___|__//`|``|```````|`    |      ``:|````````|:```````|```````|```|`````|                //
//      /     /  /``|``|``````|/     |        :|     ```:|```````|```````|``++````++                //
//     /     / //```|``|``````|      |        |:        :|    ```|```````|```++``++`\               //
//     |    /  /````|``|``````/    _.::::.    |          |      |    ````|```|`++`\`|               //
//     |   /   |````|``|`````|            `                    |       ``|```++``++`|               //
//     |  /    |````|``|`````|                                 :         |``++````++|               //
//     | /     /````|``|`````|                              _.-:::.      |..`|``.`|.|               //
//     |/     /`````|``|`````|                                     `     |```|````|`|               //
//    /|      |`````|``|`````|                    :'                    .|```|````|.|               //
//   / |      |`````|``|`````|                                         /|-|``|````|`|               //
//  /  |      |`````|```\````|                                        / ||```|````|``\              //
// /   |      |`````|````|```|::                                    /_| ||```|````|``|              //
//            |`````|````|```|:|:.        `.._                    .\___/:|```|````|``|              //
//            |`````\````|```|:|::-          ``:::....           -:|:|:::|```|````|``|              //
//            |``````|```|```|:|::`|.                          .:::|:|:::|```|````|``|              //
//             \`````|```|```|:|::/|--.                     .`:|:::|:|:::/```|````|``|              //
//              |````|```|```\:|:|:|-----             _..-:|:|:|:::|:|::|````|````|`/               //
//              |````|```|````\|:|:|-------.____.....------|/::|:::|:|::|````|````|`|               //
//              |````|```|\````\:|/\___________    ________/\--\:::|:|::|````/````|`|               //
//              |````\```| \```|:/-------------\  /----------\``\::|:|::|```/`````|`|               //
//              |`````|``|  \``|/---------------\/------------\_________|```|`````|`|               //
//                                                                                                  //
//////////////////////////////////////////////////////////////////////////////////////////////////////
//                                                                                                  //
//                                        Created by Aeren                                          //
//                                                                                                  //
//////////////////////////////////////////////////////////////////////////////////////////////////////

Measured memory_bytes: 13776