import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static final int MOD = 1000000007;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int m = sc.nextInt();
        char[] chars = sc.next().toCharArray();
        long[] counts = new long[n];
        HashMap<Integer, ArrayList<Integer>> paths = new HashMap<>();
        for (int i = 0; i < m; i++) {
            int a = sc.nextInt() - 1;
            int b = sc.nextInt() - 1;
            if (chars[a] == 'D') {
                if (chars[b] == 'P') {
                    counts[a]++;
                } else if (chars[b] == 'C') {
                    if (!paths.containsKey(a)) {
                        paths.put(a, new ArrayList<>());
                    }
                    paths.get(a).add(b);
                }
            } else if (chars[a] == 'C') {
                if (chars[b] == 'A') {
                    counts[a]++;
                }
            }
            if (chars[b] == 'D') {
                if (chars[a] == 'P') {
                    counts[b]++;
                } else if (chars[a] == 'C') {
                    if (!paths.containsKey(b)) {
                        paths.put(b, new ArrayList<>());
                    }
                    paths.get(b).add(a);
                }
            } else if (chars[b] == 'C') {
                if (chars[a] == 'A') {
                    counts[b]++;
                }
            }
        }
        long ans = 0;
        for (int x : paths.keySet()) {
            if (counts[x] == 0) {
                continue;
            }
            for (int y : paths.get(x)) {
                ans += counts[x] * counts[y] % MOD;
                ans %= MOD;
            }
        }
        System.out.println(ans);
    }
} 
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}