#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(void) {
const char* str = "123654321";
for (const char *p = str ; *p ; cnt += (*p++ == '2'))
;
char *out = res;
const char *in = str;
while (*in) {
if (*in == '2') {
*out++ = 'B';
*out++ = 'a';
} else {
*out++ = *in;
}
in++;
}
*out++ = '\0';
return 0;
}
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