O=O

#include<stdio.h>
void read_input(int x[] , int y);
void show(int x[] , int y);
void replace(int num[],int y, int find, int rep);

int find(int num[],int y, int key);

int main(){

    int num[5];

    int fin,rep,key,key2;

    read_input(num , 5);
    printf("find :");
    scanf("%d",&fin);
    printf("replace :");
    scanf("%d",&rep);
    printf("key :");
    scanf("%d",&key);

    replace(num, 5, fin, rep);
    key2 = find(num, 5, key);
    show(num , 5);
    printf("\n%d",key2);

    return 0;
 }
void read_input(int x[] , int y){
    int i=0;
    while(i!=y){
        scanf("%d",&x[i]);
     i++;
}


}
void show(int x[] , int y){
    int i=0;
    while(i!=y){
        printf("%d ",x[i]);
     i++;
    }

}
void replace(int num[],int y, int find, int rep){

    int i=0;
    while(i!=y){
        if (num[i]==find){
            num[i]=rep;
        }
        i++;
    }
}
int find(int num[],int y, int key){
    int i = 0;
    int k;
    for(i=0;i<y;i++){
        if(num[i] == key){
            return i+1;
        }
    }
    return -1;
}