Who brings out Mowgli from the cold lains of the monkey group & how

I'm not sure what you mean by monkey "lane".

I believe you mean 'monkey lair'. The monkeys were not counted as one of the jungle's people. They had no memory and no law. The folk of the jungle ignored them. When Mowgli was taken to the monkey's 'cold lair' he was rescued by the serpent 'Kaa the Rock Python'. 1."The Cold Lairs was an old deserted city, lost and buried in the jungle, and beasts seldom use a place that men have once used." 2. " Kaa was everything that the monkeys feared in the jungle, for none of them knew the limits of his power, none of them could look him in the face, and none had ever come alive out of his hug."

Kaa scares off the monkeys, and then breaks down a wall of a ruined building where Mowgl has been trapped by the monkeys. From that point on Mowgli and Kaa are friends.