diff --git a/exam/packet.tex b/exam/packet.tex
index 817397d..1f338f7 100644
--- a/exam/packet.tex
+++ b/exam/packet.tex
@@ -156,7 +156,7 @@ You are given a string S composed of only the characters \‘6\’, \‘7\’, \
 \inputformat
 \begin{itemize}
     \item The first line consists of the string S. The string consists only of the characters 6, 7, A, B, and #.
-    \item \texttt{s} ($1 \leq |s| \leq 10^5$)
+    \item It is guaranteed that \texttt{s} ($1 \leq |s| \leq 10^5$)
 \end{itemize}
 
 \outputformat