N = input()
K = input()
lines = []
for i in xrange(K):
    lines.append(map(lambda x:x-1, map(int, raw_input().split()))) 
    
pos_dist = map(int, raw_input().split())
pos_dist = map(lambda x: x-1, pos_dist)
pos_mid = list(pos_dist)
for s in lines:
    pos_mid[s[0]], pos_mid[s[1]] = pos_mid[s[1]], pos_mid[s[0]]
    
cnt = 0
lines_new = []
for n in range(N):
    i = pos_mid.index(n)
    while i > n:
        if pos_mid[i-1] > pos_mid[i]:
            pos_mid[i-1], pos_mid[i] = pos_mid[i], pos_mid[i-1]
            lines_new.append([i, i+1])
            cnt += 1
        i -= 1

print cnt
for i in lines_new:
    print i[0], i[1]