/in/foo.cc: In function 'int main()':
/in/foo.cc:51:10: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
          gets(tu);
          ^~~~
In file included from /in/foo.cc:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:51:17: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
          gets(tu);
                 ^
In file included from /in/foo.cc:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:54:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j=0;j<strlen(tu);j++)
                         ~^~~~~~~~~~~
/in/foo.cc:75:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j=0;j<strlen(tu);j++)
                         ~^~~~~~~~~~~
/tmp/ccjd0WZz.o: In function `main':
foo.cc:(.text.startup+0xa8): warning: the `gets' function is dangerous and should not be used.