#!/usr/bin/awk -f

BEGIN {
	OFS = "\t"
}

{
	login = $1
	domain = $3
	data[login][domain] = 1
}

END {
	for ( login in data ) {
		domains = ""
		nb = 0
		for ( domain in data[login] ) {
			nb += 1
			domains = (domains "\t" domain)
		}
		print nb, login, domains
	}
}