#include <bits/stdc++.h>
#include <iomanip>
#include <math.h>
#include <unistd.h>
#include <stdio.h>
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
/*ここからマクロ*/
#define all(a) (a).begin(),(a).end()
#define vecin(a) rep(i,a.size())cin >> a[i]
#define vecout(a) rep(i,a.size()){cout << a[i];cout << (i == a.size() - 1 ? "\n":" ");}
#define overload4(_1,_2,_3,_4,name,...) name
#define rep1(n) for(ll i=0;i<n;++i)
#define rep2(i,n) for(ll i=0;i<n;++i)
#define rep3(i,a,b) for(ll i=a;i<b;++i)
#define rep4(i,a,b,c) for(ll i=a;i<b;i+=c)
/*#define rep1(n) for(int i=0;i<n;++i)
#define rep2(i,n) for(int i=0;i<n;++i)
#define rep3(i,a,b) for(int i=a;i<b;++i)
#define rep4(i,a,b,c) for(int i=a;i<b;i+=c)*/
#define rep(...) overload4(__VA_ARGS__,rep4,rep3,rep2,rep1)(__VA_ARGS__)
#define mp make_pair
#define debug(x) cerr << #x << ": " << x << "\n"
using ll = long long;
using ld = long double;
using namespace std;
using dou = double;
const ll inf = 2147483647;
const ll INF = 1LL << 60;
const dou pi = 3.14159265358;
const ll mod = 1000000007LL;
//const ll mod = 998244353LL;
typedef pair<ll,ll> P;
using graph = vector<vector<ll>>;
template<class T, class U> inline bool chmin(T& a, const U& b){ if(a > b){ a = b; return 1; } return 0; }
template<class T, class U> inline bool chmax(T& a, const U& b){ if(a < b){ a = b; return 1; } return 0; }
template<class T, class U> inline bool change(T& a,U& b){if(a > b){swap(a,b);return 1;}return 0;}
//0の場合のアレンジに注意
template<class T>
T gcd(T a,T b){
    if(a == 0)return b;
    else if(b == 0)return a;
    if(a < b)swap(a,b);
    if(a % b == 0)return b;
    else return gcd(b,a%b);
}
template<class T>
T lcm(T a,T b){
    return a / gcd(a,b) * b;
}

//素数判定O(sqrt(N))
template<class T>
inline bool isp(T n){
    bool res = true;
    if(n == 1)return false;
    else{
        for(ll i = 2;i * i <= n;i++){
            if(n % i == 0){
                res = false;
                break;
            }
        }
        return res;
    }
}
const ll cmax = 1000000;
vector<ll> fac(cmax),finv(cmax),inv(cmax);

// テーブルを作る前処理
void COMinit() {
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for (ll i = 2; i < cmax; i++){
        fac[i] = fac[i - 1] * i % mod;
        inv[i] = mod - inv[mod%i] * (mod / i) % mod;
        finv[i] = finv[i - 1] * inv[i] % mod;
    }
}

// 二項係数計算
ll nCk(ll n, ll k){
    if(fac[0] == 0)COMinit();
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * (finv[k] * finv[n - k] % mod) % mod;
}
//nのm乗をMODで割ったあまりO(logm)
ll modpow(ll n,ll m,ll MOD){
    if(m == 0)return 1;
    if(m < 0)return -1;
    ll res = 1;
    while(m){
        if(m & 1)res = (res * n) % MOD;
        m >>= 1;
        n *= n;
        n %= MOD;
    }
    return res;
}
ll mypow(ll n,ll m){
    if(m == 0)return 1;
    if(m < 0)return -1;
    ll res = 1;
    while(m){
        if(m & 1)res = (res * n);
        m >>= 1;
        n *= n;
    }
    return res;
}

template<class T = ll>
T in(){T x;cin >> x;return x;}

/*~~~~~~~~マクロここまで~~~~~~~*/

struct segtree{
    ll n;
    vector<ll> dat;
    segtree(ll n_):n(),dat(n_ * 4,0){
        ll x = 1;
        while(x < n_){
            x *= 2;
        }
        n = x;
    }
    void set(ll a,ll b){
        a += n - 1;
        dat[a] = b;
    }
    void build(){
        for(ll i = n - 2;i >= 0;i--){
            dat[i] = dat[i * 2 + 1] | dat[i * 2 + 2];
        }
    }
    void update(ll a,ll b){
        a += n - 1;
        dat[a] = b;
        while(a > 0){
            a = (a - 1) / 2;
            dat[a] = dat[a * 2 + 1] | dat[a * 2 + 2];
        }
    }
    ll query_sub(ll a,ll b,ll k,ll l,ll r){
        if(a >= r || b <= l){
            return 0;
        }
        else if(a <= l && r <= b){
            return dat[k];
        }
        else{
            ll le = query_sub(a,b,k * 2 + 1,l,(l + r) / 2);
            ll ri = query_sub(a,b,k * 2 + 2,(l + r) / 2,r);
            return le | ri;
        }
    }
    ll query(ll a,ll b){
        return query_sub(a,b,0,0,n);
    }
};

ll popcount(ll n){
    ll res = 0;
    while(n){
        if(n&1)res++;
        n >>= 1;
    }
    return res;
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    ll N,Q;string S;
    cin >> N >> S >> Q;
    segtree ST(N);
    map<char,ll> ma;
    for(char c = 'a';c <= 'z';c++){
        ma[c] = c - 'a';
    }
    rep(i,N){
        ST.set(i,1LL << ma[S[i]]);
    }
    ST.build();
    ll t;
    rep(i,Q){
        cin >> t;
        if(t == 1){
            ll a;char c;
            cin >> a >> c;
            a--;
            ST.update(a,1LL << ma[c]);
        }
        else{
            ll a,b;
            cin >> a >> b;
            a--;
            cout << popcount(ST.query(a,b)) << "\n";
        }
    }
}

Measured memory_bytes: 42976