N,M =map(int,input().split())
str =input()
pdca ={l:set() for l in "PDCA"}
line ={i+1:set() for i in range(N)}

for i,st in enumerate(str):
    pdca[st].add(i+1)

for i in range(M):
    s,t =map(int,input().split())
    line[s].add(t)
    line[t].add(s)

sum = 0

for np in pdca["P"]:
    for nd in line[np]:
        if nd in pdca["D"]:
            for nc in line[nd]:
                if nc in pdca["C"]:
                    for nd in line[nc]:
                        if nd in pdca["A"]:
                            sum +=1
print(sum%1000000007)