gistfile1.cpp

#include <iostream>
#include <regex>
#include <cstdio>
#include <cstring>
using namespace std;

int main() {
	char input[30] = {0}, first[30] = {0}, middle[30] = {0}, last[30] = {0};
	
    while ( cin.getline(input, sizeof(input)) ) {
        if( regex_match( input, regex("[a-zA-Z.]+[ ][a-zA-Z.]+[ ][a-zA-Z.]+") ) ) {
            sscanf( input, "%s %s %s", first, middle, last);
            middle[1] = '.';
            middle[2] = '\0';
            cout << last << ", " << first << ' ' << middle << endl;
        }
        else {
            sscanf( input, "%s %s", first, last);
            cout << last << ", " << first << endl;
        }
        
        memset(input, 0, sizeof(input));
        memset(first, 0, sizeof(first));
        memset(middle, 0, sizeof(middle));
        memset(last, 0, sizeof(last));
    }
	return 0;
}