771 B | 771 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
# sys.setrecursionlimit(10**7)
BLANK = " "
# inp = input
inp = lambda : sys.stdin.readline().rstrip()
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 diff(a, b):
ret= 0
for i in range(len(a)):
if a[i] != b[i]:
ret += 1
return ret
def solve():
s = inp()
n = ii()
l = [inp() for _ in range(n)]
for i in range(n):
if len(l[i]) != len(s):
continue
if diff(l[i], s) <= 1:
p(i + 1)
break
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()