from string import *

def readPajek(filename):
    f = open(filename,'r')
    lines = f.readlines()
    f.close()
    line0 = split(lines[0])
    nodes = int(line0[1])
    graph = {}
    for i in range(1,nodes+1):
        graph[i]=[]
    for i in range(nodes+2,len(lines)):
        aline = split(lines[i])
        src =  int(aline[0])
        target = int(aline[1])
        graph[src].append(target)
        graph[target].append(src)
    return  graph   
   

agraph = readPajek('pedro.net')
print agraph