#!/usr/bin/python3

def main():
       
        dic={'one':'dog','two':'cat','three':'cow'}
        for el in dic:
               print(el)
        for key,el in dic.items():
               print ("{}={}".format(key,el))
        dic2={x:x**2 for x in range(10)}
        for key,el in dic2.items():
                 print ("{}={}".format(key,el))       
        tp=(1,2,3,4)
        print (id(tp))
        print (tp[0])
        for v in tp:
              print (v)
        tp=(1,2,3)
        print (id(tp))

if __name__=="__main__":
        main()