You are given a string S of length N consisting of lowercase English letters.
Process Q queries of the following two types:
 - Type 1: change the i_q-th character of S to c_q. (Do nothing if the i_q-th character is already c_q.)
 - Type 2: answer the number of different characters occurring in the substring of S between the l_q-th and r_q-th characters (inclusive).

-----Constraints-----
 - N, Q, i_q, l_q, and r_q are integers.
 - S is a string consisting of lowercase English letters.
 - c_q is a lowercase English letter.
 - 1 \leq N \leq 500000
 - 1 \leq Q \leq 20000
 - |S| = N
 - 1 \leq i_q \leq N
 - 1 \leq l_q \leq r_q \leq N
 - There is at least one query of type 2 in each testcase.

-----Input-----
Input is given from Standard Input in the following format:
N
S
Q
Query_1
\vdots
Query_Q

Here, Query_i in the 4-th through (Q+3)-th lines is one of the following:
1 i_q c_q

2 l_q r_q

-----Output-----
For each query of type 2, print a line containing the answer.

-----Sample Input-----
7
abcdbbd
6
2 3 6
1 5 z
2 1 1
1 4 a
1 7 d
2 1 7

-----Sample Output-----
3
1
5

In the first query, cdbb contains three kinds of letters: b , c , and d, so we print 3.
In the second query, S is modified to abcdzbd.
In the third query, a contains one kind of letter: a, so we print 1.
In the fourth query, S is modified to abcazbd.
In the fifth query, S does not change and is still abcazbd.
In the sixth query, abcazbd contains five kinds of letters: a, b, c, d, and z, so we print 5.

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

ns = {"__name__": "__main__"}
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = '#!python3\n\nimport sys\n\ninput = sys.stdin.readline\n\ndef resolve():\n    N = int(input())\n    S = list(input())\n    Q = int(input())\n\n    c0 = ord(\'a\')\n    smap = [1<<(i-c0) for i in range(c0, ord(\'z\')+1)]\n\n    T = [0]*N + [smap[ord(S[i])-c0] for i in range(N)]\n\n    for i in range(N-1, 0, -1):\n        i2 = i << 1\n        T[i] = T[i2] | T[i2|1]\n\n    ans = []\n    #print(T)\n    for cmd, i, j in zip(*[iter(sys.stdin.read().split())]*3):\n        i = int(i) - 1\n        if cmd == "1":\n            if S[i] == j:\n                continue\n\n            S[i] = j\n            i0 = N + i\n            T[i0] = smap[ord(j)-c0]\n            while i0 > 1:\n                i0 = i0 >> 1\n                T[i0] = T[i0+i0] | T[i0-~i0]\n        elif cmd == "2":\n            i += N\n            j = int(j) + N\n\n            d1 = 0\n            while i < j:\n                if i & 1:\n                    d1 |= T[i]\n                    i += 1\n                if j & 1:\n                    j -= 1\n                    d1 |= T[j]\n\n                i >>= 1; j >>=1\n\n            ans.append(bin(d1).count(\'1\'))\n\n    print(*ans, sep="\\n")\n\ndef __starting_point():\n    resolve()\n\n__starting_point()'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

```

Measured memory_bytes: 16370