import sys
sys.setrecursionlimit(5*10**5)
input = sys.stdin.readline
from collections import defaultdict, deque, Counter
from heapq import heappop, heappush
from bisect import bisect_left, bisect_right
from math import gcd

n,m,k = map(int,input().split())
graph = [[] for i in range(n+1)]
for i in range(m):
    u,v = map(int,input().split())
    graph[u-1].append(v-1)
    graph[v-1].append(u-1)
mod = 998244353
mem = dict()
wa = 0
for i in range(n):
    wa += k*pow(10, i)
pows = [pow(10, i) for i in range(10)]
def f(cnt):
    if cnt//10 == wa:
        return 1
    if cnt in mem.keys():
        return mem[cnt]
    res = 0
    last = cnt % 10
    for nxt in graph[last]:
        now = (cnt//pows[nxt+1]) % 10
        if now == k: continue
        new = cnt//10
        new += pows[nxt]
        new = new*10 + nxt
        res += f(new)
        res %= mod
    mem[cnt] = res
    return res
    
ans = 0
for i in range(n):
    cnt = 0
    cnt += pow(10, i+1)
    ans += f(cnt+i)
    ans %= mod


print(ans)