#include<fstream>Fisier
#include<iostream>
using namespace std;
int main()
{ifstream g("bac");
long x, k,p,i;
g>>x>>k;
char n[5000]; // numarul de k cifre citit intr-un sir de caractere
g>>n;
/*cout<<k<<endl;
cout<<n<<endl;
cout<<endl;*/
int f[100];
f[0]=0;
f[1]=1;
for(i=2;;i++)
{f[i]=f[i-1]+f[i-2];
if(f[i]==k)
{p=f[i]-f[i-1];
break;}
}
for(i=0;i<k-p;i++)
cout<<n[i];
}
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