def medyan(list):
    if len(list) % 2 ==1:
        ortanca=(len(list)-1)/2
    i=0
    j=1
    while j<=len(list)-1:
        if list[i]<list[j]:
            en_kucuk=list[i]
            j=j+1
        else:
            en_kucuk=list[j]
            i=j
            j=j+1
        if len(list)==ortanca:
            break
        else:
            list.remove(en_kucuk)
            continue

    print ("medyan=",en_kucuk)
list=[18,19,4,6,7,8,3]
medyan(list)