x=str()
def check_key(d,x):
    for i in d:
        if i==x:
            print("exists")
        else:
            print("not exist")
check_key({'etisalat':'011','vodafone':'010'},"etisalat")

x=str()
def check_key(d,x):
    for i in d:
        if i==x:
            print("exists")
        else:
            print("not exist")
check_key({'etisalat':'011','vodafone':'010'},"etisalat")