fractiles.py

import sys, math
inp = open("in.txt")
out = open("out.txt","w+")
sys.stdout = out

t = int(inp.readline())

def print_case(case, result):
    print "Case #%d: %s" % (case, str(result))


for tc in xrange(t):
    length, complexity, students = [int(x) for x in inp.readline().split()]
    if complexity == 1 and students < length:
        print_case(tc+1, "IMPOSSIBLE")
        continue
        
    if students < length - 1:
        print_case(tc+1, "IMPOSSIBLE")
        continue
    
    if length == 1:
        print_case(tc+1, "1")
        continue
    
    l = range(2, length+1)
    print_case(tc+1, " ".join(map(str, l)))