def naturalize_intkeydict(ikd):
    """
        ikd = {3:'a',1:'b',2:'c',11:'d',0:'e',50:'f'}
        naturalize_intkeydict(ikd) == {0: 'e', 1: 'b', 2: 'c', 3: 'a', 4: 'd', 5: 'f'} 
    """
    ltd = {}
    ks = sorted(list(ikd.keys()))
    for i in range(0, ks.__len__()):
        ltd[i] = ikd[ks[i]]
    return ltd
