#!/bin/python3

import sys


n,q = input().strip().split(' ')
n,q = [int(n),int(q)]
s = input().strip()
for a0 in range(q):
    # your code goes here
    case=list(map(int,input().split()))
    if case[0]==1:
        t=case[3]%26
        i,j=case[1],case[2]
        s=s[:i]+s[j+1:]
    if case[0]==2:
        print(case[2]-case[1]+1)