Для Дена.

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#include <iostream>
#include <cstdlib>
using namespace std;
int main(int argc, char *argv[])
{
FILE *f;
FILE *g;
f = fopen("in.txt", "r");
if(!f)
{
perror("in.txt error");
}
else
{
g = fopen("out.txt", "w+");
if(!g)
{
perror("out.txt error");
}
else
{
char prev, next;
while(!feof(f))
{
fscanf(f, "%c", &next);
if(prev == 'a')
{
fprintf(g, "%c ", next);
}
prev = next;
}
fclose(g);
}
fclose(f);
}
cout << "All done. See in.txt and out.txt" << endl
;
return EXIT_SUCCESS;
}