#!/bin/bash

cat "$1" | cut -d: -f1,3 | fgrep , | while read SOR
do
    echo $SOR | cut -d: -f2 | tr -cd , | wc -c | tr -d '\n'
    echo -n :
    echo $SOR | cut -d: -f1
done | sort -n | tail -n1 | cut -d: -f2