C
c
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#include <stdio.h>
#include <ctype.h>
int main() {
char sentence[100], copy[100];
gets(sentence);
int i = 0, k = 0;
while(sentence[i] != '\0')
{
if(isalpha(sentence[i]) != 0 || sentence[i] == ' ' || isdigit(sentence[i]) != 0)
{
copy[k] = sentence[i];
k++;
}
i++;
}
puts(copy);
return 0;
}
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