# your code goes here
def takeIndex (str, c, index):
count = 0
for i in range(len(str)):
if (str[i] == c):
count += 1
if (count == index):
return i
if (count == 0):
return -1
a = "quan tri mang cham com"
print (takeIndex(a, 'a', 2))
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCmRlZiB0YWtlSW5kZXggKHN0ciwgYywgaW5kZXgpOgoJY291bnQgPSAwCglmb3IgaSBpbiByYW5nZShsZW4oc3RyKSk6CgkJaWYgKHN0cltpXSA9PSBjKToKCQkJY291bnQgKz0gMQoJCQlpZiAoY291bnQgPT0gaW5kZXgpOgoJCQkJcmV0dXJuIGkKCWlmIChjb3VudCA9PSAwKToKCQlyZXR1cm4gLTEKCmEgPSAicXVhbiB0cmkgbWFuZyBjaGFtIGNvbSIKcHJpbnQgKHRha2VJbmRleChhLCAnYScsIDIpKQ==