language: Pike (pike 7.6.86)
date: 253 days 20 hours ago
link:
visibility: public 
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import Stdio;
 
int main()
{
        int n,n1,n2,i,d;
        string s1,s2;
        sscanf(stdin->gets(), "%d", n);
        sscanf(stdin->gets(), "%s", s1);
        sscanf(stdin->gets(), "%s", s2);
        n1 = sizeof(s1);
        n2 = sizeof(s2);
        d=0;
        for (i=0;i<n1 && i<n2 && s1[i]==s2[i];i=i+1) d=d+2;
        if (n1+n2-d <= n) write("YES\n"); else write("NO\n");
   return 0;
}