import std.stdio, std.conv, std.string, std.bigint;
import std.math, std.random, std.datetime;
import std.array, std.range, std.algorithm, std.container, std.format;
string read(){ static string[] ss; while(!ss.length) ss = readln.chomp.split; string res = ss[0]; ss.popFront; return res; }

const long MOD = 1000000007;

class Node{
 int id;
 char value;
 bool hasMemo;
 long memo;
 Node[] nodes;
 this(int id){
  this.id = id;
 }
 override string toString(){
  return this.id.to!string ~ " " ~ this.value;
 }
}


void main(){
 int n = read.to!int;
 Node[] nodes;
 foreach(i; 0 .. n) nodes ~= new Node(i);

 int m = read.to!int;
	
 string s = readln.chomp;
 foreach(i, c; s) nodes[i].value = c;
	
 foreach(i; 0 .. m){
  int u = read.to!int - 1, v = read.to!int - 1;
  nodes[u].nodes ~= nodes[v];
  nodes[v].nodes ~= nodes[u];
 }
	
 long ans = 0;
 foreach(nd1; nodes){
  if(nd1.value != 'P') continue;
  if(! nd1.hasMemo){
   nd1.memo = 0;
   foreach(nd2; nd1.nodes){
    if(nd2.value != 'D') continue;
    if(! nd2.hasMemo){
     nd2.memo = 0;
     foreach(nd3; nd2.nodes){
      if(nd3.value != 'C') continue;
      if(! nd3.hasMemo){
       nd3.memo = 0;
       foreach(nd4; nd3.nodes){
        if(nd4.value != 'A') continue;
        nd3.memo += 1;
        nd3.memo  %= MOD;
       }
       nd3.hasMemo = 1;
      }
      nd2.memo += nd3.memo;
      nd2.memo %= MOD;
     }
     nd2.hasMemo = 1;
    }
    nd1.memo += nd2.memo;
    nd1.memo %= MOD;
   }
   nd1.hasMemo = 1;
  }
  ans += nd1.memo;
  ans %= MOD;
 }
	
 ans.writeln;
}