package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
	return scanner
}
func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}
func getNextUint64(scanner *bufio.Scanner) uint64 {
	i, _ := strconv.ParseUint(getNextString(scanner), 10, 64)
	return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	cnt := 0
	if os.Getenv("MASPY") == "ますピ" {
		fp, _ = os.Open(os.Getenv("BEET_THE_HARMONY_OF_PERFECT"))
		cnt = 2
	}
	if os.Getenv("MASPYPY") == "ますピッピ" {
		wfp, _ = os.Create(os.Getenv("NGTKANA_IS_GENIUS10"))
	}
	scanner := getScanner(fp)
	writer := bufio.NewWriter(wfp)
	solve(scanner, writer)
	for i := 0; i < cnt; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
	writer.Flush()
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	n := getNextInt(scanner)
	m := getNextInt(scanner)
	s := getNextString(scanner)
	g := newGraph(n)

	for i := 0; i < n; i++ {
		g.v[i] = new(vertex)
		g.v[i].ch = s[i]
		if s[i] == 'P' {
			g.v[i].into = 1
		}
	}
	for i := 0; i < m; i++ {
		u := getNextInt(scanner) - 1
		v := getNextInt(scanner) - 1
		g.appendEdge(u, v, i)
		g.appendEdge(v, u, i)
	}
	moves := [3][2]byte{
		[2]byte{'P', 'D'},
		[2]byte{'D', 'C'},
		[2]byte{'C', 'A'},
	}
	for c := 0; c < 3; c++ {
		for i := 0; i < n; i++ {
			if g.v[i].ch == moves[c][0] {
				for _, e := range g.e[i] {
					if g.v[e.to].ch == moves[c][1] {
						g.v[e.to].into.addAs(g.v[i].into)
					}
				}
			}
		}
	}
	var ans mint
	for i := 0; i < n; i++ {
		if g.v[i].ch == 'A' {
			ans.addAs(g.v[i].into)
		}
	}
	fmt.Fprintln(writer, ans)

}

type graph struct {
	v []*vertex
	e [][]*edge
}

func newGraph(n int) *graph {
	return &graph{
		v: make([]*vertex, n),
		e: make([][]*edge, n),
	}
}
func (g *graph) appendEdge(from, to, id int) {
	g.e[from] = append(g.e[from], &edge{
		to: to,
		id: id,
	})
}

type vertex struct {
	ch   byte
	into mint
}
type edge struct {
	to, id int
}

type mint int

func (mt mint) mod() mint {
	m := mint(1e9 + 7)
	mt %= m
	if mt < 0 {
		return mt + m
	}
	return mt
}
func (mt mint) inv() mint {
	var m, y mint
	m.subAs(2)
	dbl := mt
	y = 1
	for i := 0; i < 31; i++ {
		if m%2 == 1 {
			y.mulAs(dbl)
		}
		m >>= 1
		dbl.mulAs(dbl)
	}
	return y
}
func (mt mint) add(x mint) mint {
	return (mt + x).mod()
}
func (mt mint) sub(x mint) mint {
	return (mt - x).mod()
}
func (mt mint) mul(x mint) mint {
	return (mt * x).mod()
}
func (mt mint) div(x mint) mint {
	return mt.mul(x.inv())
}
func (mt *mint) addAs(x mint) *mint {
	*mt = mt.add(x)
	return mt
}
func (mt *mint) subAs(x mint) *mint {
	*mt = mt.sub(x)
	return mt
}
func (mt *mint) mulAs(x mint) *mint {
	*mt = mt.mul(x)
	return mt
}
func (mt *mint) divAs(x mint) *mint {
	*mt = mt.div(x)
	return mt
}