How can you know str1 and str2? about ctf-notes HOT 1 CLOSED

gdb-peda$ context
[----------------------------------registers-----------------------------------]
EAX: 0xffffd9a4 ("ahJd\024\032G\031\003r6\bl\033.jl\032UghvFd{\035P\177gc\022\005a\005")
EBX: 0x1e
ECX: 0x0
EDX: 0x3c ('<')
ESI: 0xffffd9d4 ('A' <repeats 30 times>, "\n")
EDI: 0x0
EBP: 0x0
ESP: 0xffffd9a4 ("ahJd\024\032G\031\003r6\bl\033.jl\032UghvFd{\035P\177gc\022\005a\005")
EIP: 0x8048121 (mov    dl,BYTE PTR [eax])
EFLAGS: 0x297 (CARRY PARITY ADJUST zero SIGN trap INTERRUPT direction overflow)
[-------------------------------------code-------------------------------------]
   0x804811b:	xor    ecx,ecx
   0x804811d:	cmp    ecx,ebx
   0x804811f:	jge    0x8048131
=> 0x8048121:	mov    dl,BYTE PTR [eax]
   0x8048123:	xor    dl,BYTE PTR [esi+ecx*1]
   0x8048126:	mov    BYTE PTR [esi+ecx*1],dl
   0x8048129:	add    eax,0x1
   0x804812c:	add    ecx,0x1
[------------------------------------stack-------------------------------------]
0000| 0xffffd9a4 ("ahJd\024\032G\031\003r6\bl\033.jl\032UghvFd{\035P\177gc\022\005a\005")
0004| 0xffffd9a8 --> 0x19471a14
0008| 0xffffd9ac --> 0x8367203
0012| 0xffffd9b0 --> 0x6a2e1b6c
0016| 0xffffd9b4 --> 0x67551a6c
0020| 0xffffd9b8 ("hvFd{\035P\177gc\022\005a\005")
0024| 0xffffd9bc --> 0x7f501d7b
0028| 0xffffd9c0 --> 0x5126367
[------------------------------------------------------------------------------]
Legend: code, data, rodata, value
gdb-peda$ x /30bx $eax
0xffffd9a4:	0x61	0x68	0x4a	0x64	0x14	0x1a	0x47	0x19
0xffffd9ac:	0x03	0x72	0x36	0x08	0x6c	0x1b	0x2e	0x6a
0xffffd9b4:	0x6c	0x1a	0x55	0x67	0x68	0x76	0x46	0x64
0xffffd9bc:	0x7b	0x1d	0x50	0x7f	0x67	0x63

gdb-peda$
[----------------------------------registers-----------------------------------]
EAX: 0x0
EBX: 0x1e
ECX: 0x1d
EDX: 0x22 ('"')
ESI: 0xffffd9d4 (" )\v%U[\006XB3wI-Zo+-[\024&)7\a%:\\\021>&\"\n")
EDI: 0x8049bcc (xor    ebp,DWORD PTR [ebx])
EBP: 0x0
ESP: 0xffffd9cc --> 0x1d
EIP: 0x8048053 (mov    edx,edi)
EFLAGS: 0x206 (carry PARITY adjust zero sign trap INTERRUPT direction overflow)
[-------------------------------------code-------------------------------------]
   0x804804d:	xor    eax,eax
   0x804804f:	test   ecx,ecx
   0x8048051:	je     0x8048064
=> 0x8048053:	mov    edx,edi
   0x8048055:	add    edx,ecx
   0x8048057:	mov    bl,BYTE PTR [edx]
   0x8048059:	mov    edx,esi
   0x804805b:	add    edx,ecx
[------------------------------------stack-------------------------------------]
0000| 0xffffd9cc --> 0x1d
0004| 0xffffd9d0 --> 0x8048145 (test   eax,eax)
0008| 0xffffd9d4 (" )\v%U[\006XB3wI-Zo+-[\024&)7\a%:\\\021>&\"\n")
0012| 0xffffd9d8 --> 0x58065b55
0016| 0xffffd9dc ("B3wI-Zo+-[\024&)7\a%:\\\021>&\"\n")
0020| 0xffffd9e0 ("-Zo+-[\024&)7\a%:\\\021>&\"\n")
0024| 0xffffd9e4 --> 0x26145b2d
0028| 0xffffd9e8 --> 0x25073729
[------------------------------------------------------------------------------]
Legend: code, data, rodata, value
0x08048053 in ?? ()
gdb-peda$ x /30bx $edi
0x8049bcc:	0x33	0x2b	0x79	0x49	0x26	0x2a	0x76	0x2f
0x8049bd4:	0x2e	0x2b	0x73	0x49	0x24	0x36	0x6a	0x2b
0x8049bdc:	0x38	0x49	0x78	0x25	0x2d	0x22	0x12	0x21
0x8049be4:	0x29	0x30	0x12	0x30	0x2e	0x2a