#include <iostream>
#include <string.h>
using namespace std;
void inv(int leng, char a[255] )
{
int i; char ch;
for (i=0; i<leng/2; ++i)
{
ch=a[i];
a[i]=a[leng-1-i];
a[leng-1-i]=ch;
}
}
int main()
{
int leng1;
char s1[255], s3[255];
cout << "introdu sirul de caractere: ";
cin.getline(s1,255);
leng1=strlen(s1);
inv(leng1, s1);
cout << s1 << "\n";
leng1=strlen(s1);
int k=-1, i;
for (i=0; i<leng1; i+=2)
{
++k; s3[k]=s1[i];
}
for (i=0; i<=k; ++i)
cout << s3[i];
return 0;
}