class SegTree:
    def __init__(self, op, e, lst):
        self.n = len(lst)
        self.N0 = 2 ** (self.n - 1).bit_length()
        self.op = op
        self.e = e
        self.data = [e] * (2 * self.N0)
        if type(lst) is list:
            for i in range(self.n):
                self.data[self.N0 + i] = lst[i]
            for i in range(self.N0 - 1, 0, -1):
                self.data[i] = self.op(self.data[2*i], self.data[2*i+1])
    
    def get(self, i):
        return self.data[self.N0+i]
    
    def set(self, i, x):
        i += self.N0
        self.data[i] = x
        while i > 1:
            i >>= 1
            self.data[i] = self.op(self.data[2*i], self.data[2*i+1])
    
    def prod(self, l, r):
        if r <= l:
            return self.e
        lres = self.e
        rres = self.e
        l += self.N0
        r += self.N0
        while l < r:
            if l & 1:
                lres = self.op(lres, self.data[l])
                l += 1
            if r & 1:
                r -= 1
                rres = self.op(self.data[r], rres)
            l >>= 1
            r >>= 1
        return self.op(lres, rres)

import sys
input = sys.stdin.readline

inf = 10**6
size = 4
N,Q = map(int, input().split())
S = input()
alp = {"A":0,"B":1,"C":2,"D":3}
D = []
for i in range(N):
    c = alp[S[i]]
    A = [inf]*16
    for i in range(4):
        for j in range(i,4):
            if i <= c <= j:
                A[i*size+j] = 0
            else:
                A[i*size+j] = 1
    D.append(A)

def op(X,Y):
    res = [inf]*16
    for i in range(4):
        for j in range(i,4):
            for k in range(i,j+1):
                res[i*size+j] = min(X[i*size+k]+Y[k*size+j],res[i*size+j]) 
    return res

e = [0]*16
st = SegTree(op, e, D)

qry = []
for _ in range(Q):
    t,x,c = input().split()
    t = int(t)
    x = int(x)-1
    if t == 1:
        c = alp[c]
    else:
        c = int(c)
    qry.append((t,x,c))

ans = []
for t,x,c in qry:
    if t == 1:
        A = [inf]*16
        for i in range(4):
            for j in range(i,4):
                if i <= c <= j:
                    A[i*size+j] = 0
                else:
                    A[i*size+j] = 1
        st.set(x,A)
    else:
        res = st.prod(x,c)
        ans.append(min(res))
print(*ans, sep = "\n")