#include <stdio.h>
int main()
{
int i,k;
char arr[50];
printf("Enter char: ");
gets(arr);
k=strlen(arr);
for(i=0;i<k;++i){
if(arr[i]=='a'||arr[i]=='e'||arr[i]=='i'||arr[i]=='o'||arr[i]=='u'||arr[i]=='A'||arr[i]=='E'||arr[i]=='I'||arr[i]=='O'||arr[i]=='U'){
printf("_");
}
else{
printf("%c",arr[i]);
}
}
}