#define _CRT_SECURE_NO_WARNINGS
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
#include <bits/stdc++.h>
using namespace std;
#define CRP(t, x) const t &x
#define OPX(op, t, x) operator op(CRP(t, x))
#define OPL(t, x) bool OPX(<, t, x) const
#define FIL(x, v) memset(x, v, sizeof(x))
#define CLR(x) FIL(x, 0)
#define NE1(x) FIL(x, -1)
#define INF(x) FIL(x, 0x3f)
#ifndef _DEBUG
#define _DEBUG 0
#endif // !_DEBUG
#define IFD if (_DEBUG)
typedef int64_t ll, i64;
typedef uint64_t ull, u64;
template <typename T>
using enable_if_arithmetic = typename enable_if<is_arithmetic<T>::value>::type;
template <typename T>
using enable_if_integral = typename enable_if<is_integral<T>::value>::type;
inline char getchar(int)
{
    static char buf[64 << 20], *S = buf, *T = buf;
    if (S == T) T = fread(S = buf, 1, 64 << 20, stdin) + buf;
    return S == T ? EOF : *S++;
}
template <typename T, typename = enable_if_integral<T>>
inline bool read(T &x)
{
    int ch = x = 0, f = 1;
    while (!isdigit(ch = getchar()))
        if (ch == EOF)
            return false;
        else if (ch == '-')
            f = 0;
    for (; isdigit(ch); ch = getchar()) x = x * 10 + ch - '0';
    return x = f ? x : -x, true;
}
template <typename T, typename... Args, typename = enable_if_integral<T>>
inline bool read(T &x, Args &... args) { return read(x) && read(args...); }
ll gcd(ll a, ll b) { return b == 0 ? a : gcd(b, a % b); }
ll fpow(ll a, ll b, ll m)
{
    ll r = 1;
    for (; b; b >>= 1, a = a * a % m)
        if (b & 1) r = r * a % m;
    return r;
}
constexpr double eps = 1e-8;
inline int sgn(double x) { return x > eps ? 1 : x < -eps ? -1 : 0; }
const int N = 1e5 + 50;
char s[N];
set<int> ss[26];
int main()
{
    scanf("%s", s+1);
    int n = strlen(s+1);
    for (int i = 1; i <= n; i++) ss[s[i] - 'a'].insert(i);
    read(n);
    for (int op, x, y; n--;)
    {
        read(op);
        if (op == 1)
        {
            read(x);
            scanf("%s", &y);
            ss[s[x] - 'a'].erase(x);
            s[x] = y;
            ss[s[x] - 'a'].insert(x);
        }
        if (op == 2)
        {
            read(x, y);
            int cnt = 0;
            for (const auto &s : ss)
            {
                auto it = s.lower_bound(x);
                if (it != s.end() && *it <= y) cnt++;
            }
            printf("%d\n", cnt);
        }
    }
    return 0;
}