#include<bits/stdc++.h>
#define int long long
#define IOS ios::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define awa return 0;
using namespace std;
int n,m;
string s,t;
bool find(string s,string t)
{
    unordered_map<char,int>scnt;
    for(char c:s)
    {
        scnt[c]++;
    }
    unordered_map<char,int>tcnt;
    for(char c:t)
    {
        tcnt[c]++;
        if(scnt[c]<tcnt[c])
        {
            return false;
        }
    }
    return true;
}
signed main()
{
    IOS;
    cin>>n>>m;
    cin>>s>>t;
    if(find(s,t))
    {
        
    }
    else
    {
        cout<<-1;
        awa
    }
    awa
}
//

answer.code: In function 'bool find(std::string, std::string)':
answer.code:10:5: error: 'unordered_map' was not declared in this scope
     unordered_map<char,int>scnt;\x0d
     ^
answer.code:10:19: error: expected primary-expression before 'char'
     unordered_map<char,int>scnt;\x0d
                   ^
answer.code:10:19: error: expected ';' before 'char'
answer.code:11:16: error: range-based 'for' loops are not allowed in C++98 mode
     for(char c:s)\x0d
                ^
answer.code:13:9: error: 's...