diff --git a/src/stack.asm b/src/stack.asm
index a68f54f..7677384 100644
--- a/src/stack.asm
+++ b/src/stack.asm
@@ -1,4 +1,4 @@
-(37, 6, 0, 0, 1, 1, 1, 1, 0, 0, 3, 2, 1, 3, 0, 0, 0, 1, 2, 1, 1, 0, 0, 1, 1, 0, 2, 2, 1, 1, 0, 2, 2, 2, 3, 1, 3, 1)
+(37, 6, 0, 0, 0, 1, 1, 1, 0, 0, 3, 2, 1, 3, 0, 0, 0, 1, 2, 1, 1, 0, 0, 1, 1, 0, 2, 2, 1, 1, 0, 2, 2, 2, 3, 1, 3, 1)
 ADD(0, 0, r0)       // r0 current state in pushdown automaton
 ADD(2, 0, r1)       // r1 cursor position in input word, (i2 first symbol of input word, i1 length of input word)
 ADD(12, 0, r11)     // r11 address of stack top
@@ -64,6 +64,7 @@ SUB(r9, 1, r9)
 JUMP(-4)
 
 
+JL(r10, r1, 2)      // check if input word hasn't been read entirely
 JE(r0, 1, 3)        // check if final state
 ADD(0, 1, o1)       // reject = 1
 JUMP(2)