NUMBER OF EVEN NUMBERS IN ALPHANUMERIC

 #NUMBER OF EVEN NUMBERS IN ALPHANUMERIC:

s=input()

c=0

for i in range(len(s)):

    if(s[i]=="0" or s[i]=="2" or s[i]=="4" or s[i]=="6" or s[i]=="8"):

        c+=1

print(c)

#ANOTHER method

s=input()

c=0

for i in s:

    if(i.isnumeric()):

        if(int(i)%2==0):

            c+=1

print(c)