/in/l6.c: In function 'main':
/in/l6.c:29:14: error: format '%d' expects argument of type 'int', but argument 2 has type 'size_t {aka long unsigned int}' [-Werror=format=]
     printf("%d %d\n",strlen(st),strlen(wd));
              ^
/in/l6.c:29:17: error: format '%d' expects argument of type 'int', but argument 3 has type 'size_t {aka long unsigned int}' [-Werror=format=]
     printf("%d %d\n",strlen(st),strlen(wd));
                 ^
cc1: all warnings being treated as errors