#include <iostream>
#include <vector>
#include <cmath>
#include <thread>
using namespace std;

const int MAXN = 200005;
const int LOGN = 20;

int n, m, q;
vector<int> edges[MAXN];
int digits[MAXN];
int up[MAXN][LOGN];
int depth[MAXN];
int len_u[MAXN];
int f[MAXN];
int pow10[MAXN];

void dfs(int u, int p) {
    up[u][0] = p;
    for (int k = 1; k < LOGN; ++k) {
        up[u][k] = up[up[u][k - 1]][k - 1];
    }
    if (p == 0) {
        f[u] = digits[u] % m;
        len_u[u] = 1;
        depth[u] = 0;
    } else {
        f[u] = (1LL * f[p] * 10 + digits[u]) % m;
        len_u[u] = len_u[p] + 1;
        depth[u] = depth[p] + 1;
    }
    for (int v : edges[u]) {
        if (v != p) {
            dfs(v, u);
        }
    }
}

int lca(int u, int v) {
    if (depth[u] < depth[v]) swap(u, v);
    for (int k = LOGN - 1; k >= 0; --k) {
        if (depth[u] - (1 << k) >= depth[v]) {
            u = up[u][k];
        }
    }
    if (u == v) return u;
    for (int k = LOGN - 1; k >= 0; --k) {
        if (up[u][k] != up[v][k]) {
            u = up[u][k];
            v = up[v][k];
        }
    }
    return up[u][0];
}

void solve() {
    cin >> n >> m >> q;
    for (int i = 0; i < n - 1; ++i) {
        int x, y;
        cin >> x >> y;
        edges[x].emplace_back(y);
        edges[y].emplace_back(x);
    }
    for (int i = 1; i <= n; ++i) {
        char c;
        cin >> c;
        digits[i] = c - '0';
    }
    pow10[0] = 1 % m;
    for (int i = 1; i <= n; ++i) {
        pow10[i] = (1LL * pow10[i - 1] * 10) % m;
    }
    dfs(1, 0);
    while (q--) {
        int a, b;
        cin >> a >> b;
        int L = lca(a, b);
        int len1 = len_u[a];
        int len2 = len_u[b] - len_u[L];
        int num1 = f[a];
        int num2 = (f[b] - (1LL * f[L] * pow10[len_u[b] - len_u[L]]) % m + m) % m;
        int result = (1LL * num1 * pow10[len2] + num2) % m;
        cout << result << '\n';
    }
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    // Using a thread to increase the stack size
    thread t(solve);
    t.join();
    return 0;
}

/usr/bin/ld: /tmp/ccosPPjm.o: in function `std::thread::_M_thread_deps_never_run()':
answer.code:(.text._ZNSt6thread24_M_thread_deps_never_runEv[_ZNSt6thread24_M_thread_deps_never_runEv]+0x9): undefined reference to `pthread_create'
/usr/bin/ld: answer.code:(.text._ZNSt6thread24_M_thread_deps_never_runEv[_ZNSt6thread24_M_thread_deps_never_runEv]+0x12): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status