- #include <stdio.h> 
- #include <stdlib.h> 
- #include <string.h> 
-   
- int main() { 
-     char t[10]; 
-     char r[10]; 
-     int c = 0; 
-     for (int i = 0; i < 10 && t[i] != 0; i++) { 
-         if (strchr("01234567890ip+-*/",-  t [- i ])) {
 
-             r[c++] = t[i]; 
-         } 
-     } 
-     r[c] = '\0'; 
- } 
-   
- //https://pt.stackoverflow.com/q/152112/101 
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