#include <cstdlib>
#include <iostream>

using namespace std;

    void Rendezes( char alma[], int n ) {
            char asd;
            
            for ( int  i = 0; i < n; i++ ) {
                  for ( int j = i + 1; j < n; j++ ) {
                         if ( alma[j] < alma[i] ) {
                                 asd = alma[i];
                                 alma[i] = alma[j];
                                 alma[j] = asd;
                              }
                      }
                }
         }
    int Kereses( char alma[], int n, char ker ) {
           int alsoh = 0;
           int felsoh = n - 1;
           int kozep = 0;
           
           
           for ( kozep = (alsoh + felsoh) / 2; felsoh >= alsoh; kozep = ( alsoh + felsoh ) / 2 ) {
                  if ( alma[kozep] == ker ) {
                         return kozep;
                       }
                  if ( alma[kozep] < ker ) {
                         alsoh = kozep + 1;
                       }
                  else {
                         felsoh = kozep - 1;
                       }
               }
               return -1; 
        }
int main(int argc, char *argv[])
{
    int n = 10;
    char alma[n];
    int a;
    char ker = 'a';
    
    for ( int i = 0; i < n; i++ ) {
          cout << "[" << i+1 << ".]: ";
          cin >> alma[i];
        }
    Rendezes( alma, n );    
    
    a = Kereses(alma, n, ker);
    
    cout << a << endl;    
    
    system("PAUSE");
    return EXIT_SUCCESS;
}