st=()
print("Welcome to M-Shop")
while True:
print("Press 1 to enter goods, 2 to get goods, 3 to see a list of goods, 0 to quit;\n")
action=input()
if action=='1':
k=input("Enter goods' name\n")
v=int(input("Enter the price of %s\n"))
st[k]=v
elif action=='2':
k=input("Enter goods'name\n")
if not k in st :
print("The %s is not recognised" %k)
else:
print("The price is %s\n" %st[v])
elif action=='3':
print(st)
elif action=='0':
print("welcome again")
break
