665 B | 665 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
BLANK = " "
inp = input
# inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
n, m = mii()
problem = mii()
ans = 0
mx = 0
for idx in range(n):
l = mii()
cnt = 0
for i in range(m):
if l[i] == problem[i]:
cnt += 1
if mx < cnt:
mx = cnt
ans = idx
p(ans + 1)
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()