Palindromi

j=str(input())
pit=len(j)-1
if len(j)%2==0:
    m=int(len(j)/2)
else:
    m=int((len(j)-1)/2)
kerrat=0
for i in range(m):
    if j[i]!=j[pit]:
        j=j[:i]+j[pit]+j[i+1:]
        kerrat+=1
    pit-=1
print(kerrat)
    
#Sara Petsalon Palindromi

Test 1 (public)

Verdict: ACCEPTED

Test 2 (public)

Verdict: ACCEPTED

Test 3 (public)

Verdict: ACCEPTED

Test 4 (public)

Verdict: ACCEPTED

Test 5 (public)

Verdict: ACCEPTED

Test 6 (public)

Verdict: ACCEPTED

Test 7 (public)

Verdict: ACCEPTED

Test 8 (public)

Verdict: ACCEPTED

Test 9 (public)

Verdict: ACCEPTED

Test 10 (public)

Verdict: ACCEPTED