diff --git a/QUSTOJ/1641.cpp b/QUSTOJ/1641.cpp
new file mode 100644
index 0000000..120c906
--- /dev/null
+++ b/QUSTOJ/1641.cpp
@@ -0,0 +1,38 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+using namespace std;
+//WTF!!! I still have to use this function!
+int strlenx(const char* inc)
+{
+    int i=0;
+    while(inc[i]!='\0') i++;
+    return i;
+}
+const char* keyboard="`1234567890-=~!@#$%^&*()_+QWERTYUIOP[]\\ASDFGHJKL;'ZXCVBNM,./M<>?L:\"P{}|";
+char change(char inc)
+{
+    int i;
+    int len=strlenx(keyboard);
+    for(i=0;i<len;i++)
+    {
+        if(inc==keyboard[i])
+        {
+            return keyboard[i-1];
+        }
+    }
+    return inc;
+}
+char cmdline[1024];
+int main()
+{
+    gets(cmdline);
+    int len=strlenx(cmdline);
+    int i;
+    for(i=0;i<len;i++)
+    {
+        cmdline[i]=change(cmdline[i]);
+    }
+    puts(cmdline);
+    return 0;
+}