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25 lines
530 B
C++

#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
char buf[1005];
int c[127];
int main()
{
int k;
scanf("%d%s",&k,buf);
int len=strlen(buf);
if(len%k)
return puts("-1"),0;
for(int i=0; i<len; i++)
c[buf[i]]++;
for(int i='a'; i<='z'; i++)
if(c[i]%k)
return puts("-1"),0;
for(int i=0; i<k; i++)
for(int j='a'; j<='z'; j++)
for(int l=0; l<c[j]/k; l++)
putchar(j);
return 0;
}