Language: C

main(i,s){for(char*t=&i;~scanf("%[^\n] ",s);puts(s))for(;*t||!strstr(t=s,"th");*t++-=*t-97?*t>>6:-25);}

Compiler output:
main.c:1:1: error: return type defaults to 'int' [-Wimplicit-int]
    1 | main(i,s){for(char*t=&i;~scanf("%[^\n] ",s);puts(s))for(;*t||!strstr(t=s,"th");*t++-=*t-97?*t>>6:-25);}
      | ^~~~
main.c: In function 'main':
main.c:1:1: error: type of 'i' defaults to 'int' [-Wimplicit-int]
main.c:1:1: error: type of 's' defaults to 'int' [-Wimplicit-int]
main.c:1:22: error: initialization of 'char *' from incompatible pointer type 'int *' [-Wincompatible-pointer-types]
    1 | main(i,s){for(char*t=&i;~scanf("%[^\n] ",s);puts(s))for(;*t||!strstr(t=s,"th");*t++-=*t-97?*t>>6:-25);}
      |                      ^
main.c:1:26: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | main(i,s){for(char*t=&i;~scanf("%[^\n] ",s);puts(s))for(;*t||!strstr(t=s,"th");*t++-=*t-97?*t>>6:-25);}
      |                          ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | main(i,s){for(char*t=&i;~scanf("%[^\n] ",s);puts(s))for(;*t||!strstr(t=s,"th");*t++-=*t-97?*t>>6:-25);}
main.c:1:26: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | main(i,s){for(char*t=&i;~scanf("%[^\n] ",s);puts(s))for(;*t||!strstr(t=s,"th");*t++-=*t-97?*t>>6:-25);}
      |                          ^~~~~
main.c:1:26: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:45: error: implicit declaration of function 'puts' [-Wimplicit-function-declaration]
    1 | main(i,s){for(char*t=&i;~scanf("%[^\n] ",s);puts(s))for(;*t||!strstr(t=s,"th");*t++-=*t-97?*t>>6:-25);}
      |                                             ^~~~
main.c:1:45: note: include '<stdio.h>' or provide a declaration of 'puts'
main.c:1:50: error: passing argument 1 of 'puts' makes pointer from integer without a cast [-Wint-conversion]
    1 | main(i,s){for(char*t=&i;~scanf("%[^\n] ",s);puts(s))for(;*t||!strstr(t=s,"th");*t++-=*t-97?*t>>6:-25);}
      |                                                  ^
      |                                                  |
      |                                                  int
main.c:1:50: note: expected 'const char *' but argument is of type 'int'
main.c:1:63: error: implicit declaration of function 'strstr' [-Wimplicit-function-declaration]
    1 | main(i,s){for(char*t=&i;~scanf("%[^\n] ",s);puts(s))for(;*t||!strstr(t=s,"th");*t++-=*t-97?*t>>6:-25);}
      |                                                               ^~~~~~
main.c:1:1: note: include '<string.h>' or provide a declaration of 'strstr'
  +++ |+#include <string.h>
    1 | main(i,s){for(char*t=&i;~scanf("%[^\n] ",s);puts(s))for(;*t||!strstr(t=s,"th");*t++-=*t-97?*t>>6:-25);}
main.c:1:63: warning: incompatible implicit declaration of built-in function 'strstr' [-Wbuiltin-declaration-mismatch]
    1 | main(i,s){for(char*t=&i;~scanf("%[^\n] ",s);puts(s))for(;*t||!strstr(t=s,"th");*t++-=*t-97?*t>>6:-25);}
      |                                                               ^~~~~~
main.c:1:63: note: include '<string.h>' or provide a declaration of 'strstr'
main.c:1:71: error: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1 | main(i,s){for(char*t=&i;~scanf("%[^\n] ",s);puts(s))for(;*t||!strstr(t=s,"th");*t++-=*t-97?*t>>6:-25);}
      |                                                                       ^