Подпалиндромы

# G
f = open('substring-palindromes.in')
fo = open('substring-palindromes.out', 'w')
s = f.readline().strip()
n = int(f.readline().strip())
for i in range(n):
    c, a, b = f.readline().strip().split()
    if(c == "change"):
        a = int(a)
        s = s[:a-1]+b[0]+s[a:]
    else:
        a = int(a)-1
        b = int(b)-1
        flag = 1
        for i in range(b-a):
            if(a+i>b-i):
                break
            if(s[a+i]!=s[b-i]):
                fo.write('No\n')
                flag = 0
                break
        if(flag):
            fo.write('Yes\n')
fo.close()
f.close()