foo.c: In function 'Diff':
foo.c:7:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    7 |   if(s[i]>='a'&& s[i]<='z')
      |   ^~
foo.c:9:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
    9 |    if(s[i]>='A'&& s[i]<='Z')
      |    ^~
foo.c: In function 'main':
foo.c:18:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
   18 |  gets(s1)!='\0';
      |  ^~~~
In file included from /usr/include/stdio.h:867,
                 from foo.c:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:235:1: note: declared here
  235 | gets (char *__str)
      | ^~~~
foo.c:18:10: warning: comparison between pointer and zero character constant [-Wpointer-compare]
   18 |  gets(s1)!='\0';
      |          ^~
foo.c:18:2: note: did you mean to dereference the pointer?
   18 |  gets(s1)!='\0';
      |  ^
foo.c:18:10: warning: value computed is not used [-Wunused-value]
   18 |  gets(s1)!='\0';
      |  ~~~~~~~~^~~~~~
foo.c:19:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
   19 |  gets(s2)!='\0';
      |  ^~~~
In file included from /usr/include/stdio.h:867,
                 from foo.c:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:235:1: note: declared here
  235 | gets (char *__str)
      | ^~~~
foo.c:19:10: warning: comparison between pointer and zero character constant [-Wpointer-compare]
   19 |  gets(s2)!='\0';
      |          ^~
foo.c:19:2: note: did you mean to dereference the pointer?
   19 |  gets(s2)!='\0';
      |  ^
foo.c:19:10: warning: value computed is not used [-Wunused-value]
   19 |  gets(s2)!='\0';
      |  ~~~~~~~~^~~~~~
foo.c: In function 'Diff':
foo.c:14:1: warning: control reaches end of non-void function [-Wreturn-type]
   14 | }
      | ^
/usr/bin/ld: /tmp/ccGkKGmd.o: in function `main':
foo.c:(.text.startup+0x4e): warning: the `gets' function is dangerous and should not be used.

[Hydro](https://hydro.ac)提供评测服务