import sys
input=sys.stdin.readline

N,M=map(int,input().split())
mod=10**9+7
S=input()

toD=[0 for i in range(N)]
toC=[0 for i in range(N)]
toA=[0 for i in range(N)]

L=[[]for i in range(N)]
for i in range(M):
    a,b=map(int,input().split())
    L[a-1].append(b-1)
    L[b-1].append(a-1)

#print(L)

for i in range(N):
    if S[i]=="P":
        for j in L[i]:
            if S[j]=="D":
                toD[j]+=1
#print(toD)

for i in range(N):
    if toD[i]>0:
        for j in L[i]:
            if S[j]=="C":
                toC[j]+=toD[i]
#print(toC)

for i in range(N):
    if toC[i]>0:
        for j in L[i]:
            if S[j]=="A":
                toA[j]+=toC[i]
print(sum(toA)%mod)