diff --git a/a5/program.c b/a5/program.c
new file mode 100644
index 0000000..e9bfb93
--- /dev/null
+++ b/a5/program.c
@@ -0,0 +1,113 @@
+#include <stdio.h>
+#include <string.h>
+
+int letters_size = 26;
+char letters[][6] = {
+        ".-",   //A
+        "-...", //B
+        "-.-.", //C
+        "-..",  //D
+        ".",    //E
+        "..-.", //F
+        "--.",  //G
+        "....", //H
+        "..",   //I
+        ".---", //J
+        "-.-",  //K
+        ".-..", //L
+        "--",   //M
+        "-.",   //N
+        "---",  //O
+        ".--.", //P
+        "--.-", //Q
+        ".-.",  //R
+        "...",  //S
+        "-",    //T
+        "..-",  //U
+        "...-", //V
+        ".--",  //W
+        "-..-", //X
+        "-.--", //Y
+        "--..", //Z
+};
+int num_size = 10;
+char numbers[][6] = {
+        "-----", //0
+        ".----", //1
+        "..---", //2
+        "...--", //3
+        "....-", //4
+        ".....", //5
+        "-....", //6
+        "--...", //7
+        "---..", //8
+        "----.", //9
+};
+
+void print_char(char word[])
+{
+    if(strlen(word)==0)
+    {
+        return;
+    }
+
+    for(int i=0; i<letters_size; i++)
+    {
+        if(strcmp(word, letters[i])==0)
+        {
+            printf("%c", i+65);
+            return;
+        }
+    }
+    for(int i=0; i<num_size; i++)
+    {
+        if(strcmp(word, numbers[i])==0)
+        {
+            printf("%c", i+48);
+            return;
+        }
+    }
+    printf("#");
+}
+
+int main()
+{
+    int size=0;
+    char word[20];
+    char c;
+    while(1)
+    {
+        if (scanf("%c", &c)==EOF)
+        {
+            word[size]=0;
+            print_char(word);
+            break;
+        }
+        if(c==' ')
+        {
+            word[size]=0;
+            print_char(word);
+            size=0;
+        }
+        else if(c=='/')
+        {
+            printf(" ");
+        }
+        else if(c=='\n')
+        {
+            if (size!=0)
+            {
+                word[size]=0;
+                print_char(word);
+                size=0;
+
+            }
+            printf("\n");
+        }
+        else
+        {
+            word[size]=c;
+            size++;
+        }
+    }
+}
\ No newline at end of file