#include <iostream>
#include <string>
#include <algorithm>
#include <iterator>
int main()
{
std::cout << "Enter string and then Ctrl + Z\n";
std::cout <<
std::count_if( std::istream_iterator<std::string>(std::cin),
(std::istream_iterator<std::string>()),
[](const std::string &str) { return str[0] == 'a'; } );
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8c3RyaW5nPgojaW5jbHVkZSA8YWxnb3JpdGhtPgojaW5jbHVkZSA8aXRlcmF0b3I+CgppbnQgbWFpbigpCnsKICAgIHN0ZDo6Y291dCA8PCAiRW50ZXIgc3RyaW5nIGFuZCB0aGVuIEN0cmwgKyBaXG4iOwogICAgc3RkOjpjb3V0IDw8CgkJc3RkOjpjb3VudF9pZiggc3RkOjppc3RyZWFtX2l0ZXJhdG9yPHN0ZDo6c3RyaW5nPihzdGQ6OmNpbiksCgkJCQkoc3RkOjppc3RyZWFtX2l0ZXJhdG9yPHN0ZDo6c3RyaW5nPigpKSwKCQkJCVtdKGNvbnN0IHN0ZDo6c3RyaW5nICZzdHIpIHsgcmV0dXJuIHN0clswXSA9PSAnYSc7IH0gKTsKCiAgICByZXR1cm4gMDsKfQ==