from collections import defaultdict

mod = 10**9+7

n, m = map(int,input().split())
S = input()

edge = [[] for _ in range(n)]
for _ in range(m):
    u, v = map(lambda x:int(x)-1,input().split())
    edge[u].append(v)
    edge[v].append(u)
  
D = {}
C = {}
A = {}

for k, v in enumerate(S):
    if v != "P":
        continue
    for to in edge[k]:
        if S[to] == "D":
            D[str(k)+" "+str(to)] = 1
    #print(D)
                
    for i in D.keys():
        j = int(i[-1])
        for to in edge[j]:
            if S[to] == "C":
                C[i+" "+str(to)] = 1
    #print(C)
    
    for i in C.keys():
        j = int(i[-1])
        for to in edge[j]:
            if S[to] == "A":
                A[i+" "+str(to)] = 1
                
    #print(A)

print(len(A.keys())%mod)