Basic problem, something for beginners. If you solve this you are at least 21 kyu :)
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
AW[ea][ga][ia][ka][ma][eb][hb][jb][mb][ec][mc][ed][fd][gd][hd][id][jd][kd][ld][md]AB[fa][la][fb][lb][fc][gc][hc][ic][jc][kc][lc]C[Black to play and live.]
(;B[ib]C[Well done, black lives in seki! RIGHT])
(;B[gb]
;W[ib]
;B[ha]C[This is only ko])
(;B[kb]
;W[ib]
;B[ja]C[This is only ko]))