#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define vl vector<ll>
#define vi vector<int>
#define pll pair<ll, ll>
#define pii pair<int, int>
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define pb push_back
#define sz(v) (int)(v.size())
#define f first
#define s second
using namespace std;
void solve()
{
ll n, i, j;
cin >> n;
string s;
cin >> s;
s = "#" + s;
ll q;
cin >> q;
while(q--)
{
ll l, r;
cin >> l >> r;
vl v;
ll sm = 0;
for(i = l; i <= r; i++)
{
if(s[i] == 'C')
{
sm++;
v.pb(1);
}
else
{
if(sm)
{
sm--;
v.pb(-1);
}
}
}
sm = 0;
vl v2;
for(i = sz(v) - 1; i >= 0; i--)
{
if(v[i] == 1)
{
sm++;
v2.pb(1);
}
else
{
if(sm)
{
sm--;
v2.pb(-1);
}
}
}
cout << r - l + 1 - sz(v2) << "\n";
}
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int tests = 1;
//cin >> tests;
while(tests--)
{
solve();
}
}
