items = [‘apple’, ‘grapes’, ‘kiwi’, ‘pear’, ‘grapes’, ‘kiwi’, ‘strawberry’]
derp={}
for i in items:
 if i in derp:
  derp[i]=derp[i]+1
 else:
  derp[i]=1

for u in derp.iterItems():
 if(u[1]>1):
  print u[0];