C++:
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main()
{
int i=0, count=0;
string s, s1, word;
cout << "String:\n";
getline(cin, s);
while (s[i])
{
if (s[i]=='a') count++;
i++;
}
if (count)
{
stringstream words(s);
while (words >> word)
{
i=count=0;
while (word[i])
{
if (word[i]=='a') count++;
i++;
}
if (count<=2) s1+=word+" ";
}
s=s1.erase(s1.size()-1);
cout << s <<"\n";
}
else cout << "Letter 'a' is absent\n";
system("pause");
return 0;
}